/*
*/

//#pragma comment(linker, "/STACK:16777216")
#define _CRT_SECURE_NO_WARNINGS

#include <fstream>
#include <iostream>
#include <string>
#include <complex>
#include <math.h>
#include <set>
#include <vector>
#include <map>
#include <queue>
#include <stdio.h>
#include <stack>
#include <algorithm>
#include <list>
#include <ctime>
#include <memory.h>
#include <assert.h>

#define y0 sdkfaslhagaklsldk
#define y1 aasdfasdfasdf
#define yn askfhwqriuperikldjk
#define j1 assdgsdgasghsf
#define tm sdfjahlfasfh
#define lr asgasgash
#define norm asdfasdgasdgsd

#define eps 1e-9
#define M_PI 3.141592653589793
#define bs 1000000007
#define bsize 256

using namespace std;

const int N = 120000;

int get_sum(int x)
{
	if (x == 0)
		return 0;
	return get_sum(x / 10) + x % 10;
}

long long S;

long long m[10000];

long long solve(long long x)
{
	long long f = x / 4000000;
	long long res = m[f];
	for (int i = f * 4000000 + 1; i <= x; i += 2)
	{
		res += get_sum(i);
	}
	return res;
}

int main(){
	//freopen("fabro.in","r",stdin);
	//freopen("fabro.out","w",stdout);
	//freopen("F:/in.txt", "r", stdin);
	//freopen("F:/output.txt", "w", stdout);
	ios_base::sync_with_stdio(0);
	//cin.tie(0);
	
	/*
	for (int i = 1; i <= 1000000000; i++)
	{
		if (i % 2 == 1)
		{
			S += get_sum(i);
		}
		if (i % 4000000 == 0)
		{
			cout << "m[" << i / 4000000 << "]=" << S << "ll;\n";
			cerr << "m[" << i / 4000000 << "]=" << S << "ll;\n";
		}
	}*/
	m[1] = 58000000ll;
	m[2] = 124000000ll;
	m[3] = 189000000ll;
	m[4] = 253000000ll;
	m[5] = 325000000ll;
	m[6] = 387000000ll;
	m[7] = 457000000ll;
	m[8] = 526000000ll;
	m[9] = 594000000ll;
	m[10] = 670000000ll;
	m[11] = 736000000ll;
	m[12] = 810000000ll;
	m[13] = 883000000ll;
	m[14] = 955000000ll;
	m[15] = 1035000000ll;
	m[16] = 1105000000ll;
	m[17] = 1183000000ll;
	m[18] = 1260000000ll;
	m[19] = 1336000000ll;
	m[20] = 1420000000ll;
	m[21] = 1494000000ll;
	m[22] = 1576000000ll;
	m[23] = 1657000000ll;
	m[24] = 1737000000ll;
	m[25] = 1825000000ll;
	m[26] = 1885000000ll;
	m[27] = 1953000000ll;
	m[28] = 2020000000ll;
	m[29] = 2086000000ll;
	m[30] = 2160000000ll;
	m[31] = 2224000000ll;
	m[32] = 2296000000ll;
	m[33] = 2367000000ll;
	m[34] = 2437000000ll;
	m[35] = 2515000000ll;
	m[36] = 2583000000ll;
	m[37] = 2659000000ll;
	m[38] = 2734000000ll;
	m[39] = 2808000000ll;
	m[40] = 2890000000ll;
	m[41] = 2962000000ll;
	m[42] = 3042000000ll;
	m[43] = 3121000000ll;
	m[44] = 3199000000ll;
	m[45] = 3285000000ll;
	m[46] = 3361000000ll;
	m[47] = 3445000000ll;
	m[48] = 3528000000ll;
	m[49] = 3610000000ll;
	m[50] = 3700000000ll;
	m[51] = 3762000000ll;
	m[52] = 3832000000ll;
	m[53] = 3901000000ll;
	m[54] = 3969000000ll;
	m[55] = 4045000000ll;
	m[56] = 4111000000ll;
	m[57] = 4185000000ll;
	m[58] = 4258000000ll;
	m[59] = 4330000000ll;
	m[60] = 4410000000ll;
	m[61] = 4480000000ll;
	m[62] = 4558000000ll;
	m[63] = 4635000000ll;
	m[64] = 4711000000ll;
	m[65] = 4795000000ll;
	m[66] = 4869000000ll;
	m[67] = 4951000000ll;
	m[68] = 5032000000ll;
	m[69] = 5112000000ll;
	m[70] = 5200000000ll;
	m[71] = 5278000000ll;
	m[72] = 5364000000ll;
	m[73] = 5449000000ll;
	m[74] = 5533000000ll;
	m[75] = 5625000000ll;
	m[76] = 5689000000ll;
	m[77] = 5761000000ll;
	m[78] = 5832000000ll;
	m[79] = 5902000000ll;
	m[80] = 5980000000ll;
	m[81] = 6048000000ll;
	m[82] = 6124000000ll;
	m[83] = 6199000000ll;
	m[84] = 6273000000ll;
	m[85] = 6355000000ll;
	m[86] = 6427000000ll;
	m[87] = 6507000000ll;
	m[88] = 6586000000ll;
	m[89] = 6664000000ll;
	m[90] = 6750000000ll;
	m[91] = 6826000000ll;
	m[92] = 6910000000ll;
	m[93] = 6993000000ll;
	m[94] = 7075000000ll;
	m[95] = 7165000000ll;
	m[96] = 7245000000ll;
	m[97] = 7333000000ll;
	m[98] = 7420000000ll;
	m[99] = 7506000000ll;
	m[100] = 7600000000ll;
	m[101] = 7666000000ll;
	m[102] = 7740000000ll;
	m[103] = 7813000000ll;
	m[104] = 7885000000ll;
	m[105] = 7965000000ll;
	m[106] = 8035000000ll;
	m[107] = 8113000000ll;
	m[108] = 8190000000ll;
	m[109] = 8266000000ll;
	m[110] = 8350000000ll;
	m[111] = 8424000000ll;
	m[112] = 8506000000ll;
	m[113] = 8587000000ll;
	m[114] = 8667000000ll;
	m[115] = 8755000000ll;
	m[116] = 8833000000ll;
	m[117] = 8919000000ll;
	m[118] = 9004000000ll;
	m[119] = 9088000000ll;
	m[120] = 9180000000ll;
	m[121] = 9262000000ll;
	m[122] = 9352000000ll;
	m[123] = 9441000000ll;
	m[124] = 9529000000ll;
	m[125] = 9625000000ll;
	m[126] = 9693000000ll;
	m[127] = 9769000000ll;
	m[128] = 9844000000ll;
	m[129] = 9918000000ll;
	m[130] = 10000000000ll;
	m[131] = 10072000000ll;
	m[132] = 10152000000ll;
	m[133] = 10231000000ll;
	m[134] = 10309000000ll;
	m[135] = 10395000000ll;
	m[136] = 10471000000ll;
	m[137] = 10555000000ll;
	m[138] = 10638000000ll;
	m[139] = 10720000000ll;
	m[140] = 10810000000ll;
	m[141] = 10890000000ll;
	m[142] = 10978000000ll;
	m[143] = 11065000000ll;
	m[144] = 11151000000ll;
	m[145] = 11245000000ll;
	m[146] = 11329000000ll;
	m[147] = 11421000000ll;
	m[148] = 11512000000ll;
	m[149] = 11602000000ll;
	m[150] = 11700000000ll;
	m[151] = 11770000000ll;
	m[152] = 11848000000ll;
	m[153] = 11925000000ll;
	m[154] = 12001000000ll;
	m[155] = 12085000000ll;
	m[156] = 12159000000ll;
	m[157] = 12241000000ll;
	m[158] = 12322000000ll;
	m[159] = 12402000000ll;
	m[160] = 12490000000ll;
	m[161] = 12568000000ll;
	m[162] = 12654000000ll;
	m[163] = 12739000000ll;
	m[164] = 12823000000ll;
	m[165] = 12915000000ll;
	m[166] = 12997000000ll;
	m[167] = 13087000000ll;
	m[168] = 13176000000ll;
	m[169] = 13264000000ll;
	m[170] = 13360000000ll;
	m[171] = 13446000000ll;
	m[172] = 13540000000ll;
	m[173] = 13633000000ll;
	m[174] = 13725000000ll;
	m[175] = 13825000000ll;
	m[176] = 13897000000ll;
	m[177] = 13977000000ll;
	m[178] = 14056000000ll;
	m[179] = 14134000000ll;
	m[180] = 14220000000ll;
	m[181] = 14296000000ll;
	m[182] = 14380000000ll;
	m[183] = 14463000000ll;
	m[184] = 14545000000ll;
	m[185] = 14635000000ll;
	m[186] = 14715000000ll;
	m[187] = 14803000000ll;
	m[188] = 14890000000ll;
	m[189] = 14976000000ll;
	m[190] = 15070000000ll;
	m[191] = 15154000000ll;
	m[192] = 15246000000ll;
	m[193] = 15337000000ll;
	m[194] = 15427000000ll;
	m[195] = 15525000000ll;
	m[196] = 15613000000ll;
	m[197] = 15709000000ll;
	m[198] = 15804000000ll;
	m[199] = 15898000000ll;
	m[200] = 16000000000ll;
	m[201] = 16074000000ll;
	m[202] = 16156000000ll;
	m[203] = 16237000000ll;
	m[204] = 16317000000ll;
	m[205] = 16405000000ll;
	m[206] = 16483000000ll;
	m[207] = 16569000000ll;
	m[208] = 16654000000ll;
	m[209] = 16738000000ll;
	m[210] = 16830000000ll;
	m[211] = 16912000000ll;
	m[212] = 17002000000ll;
	m[213] = 17091000000ll;
	m[214] = 17179000000ll;
	m[215] = 17275000000ll;
	m[216] = 17361000000ll;
	m[217] = 17455000000ll;
	m[218] = 17548000000ll;
	m[219] = 17640000000ll;
	m[220] = 17740000000ll;
	m[221] = 17830000000ll;
	m[222] = 17928000000ll;
	m[223] = 18025000000ll;
	m[224] = 18121000000ll;
	m[225] = 18225000000ll;
	m[226] = 18301000000ll;
	m[227] = 18385000000ll;
	m[228] = 18468000000ll;
	m[229] = 18550000000ll;
	m[230] = 18640000000ll;
	m[231] = 18720000000ll;
	m[232] = 18808000000ll;
	m[233] = 18895000000ll;
	m[234] = 18981000000ll;
	m[235] = 19075000000ll;
	m[236] = 19159000000ll;
	m[237] = 19251000000ll;
	m[238] = 19342000000ll;
	m[239] = 19432000000ll;
	m[240] = 19530000000ll;
	m[241] = 19618000000ll;
	m[242] = 19714000000ll;
	m[243] = 19809000000ll;
	m[244] = 19903000000ll;
	m[245] = 20005000000ll;
	m[246] = 20097000000ll;
	m[247] = 20197000000ll;
	m[248] = 20296000000ll;
	m[249] = 20394000000ll;
	m[250] = 20500000000ll;

	
	int l, r;
	cin >> l >> r;
	cout << solve(r) - solve(l - 1) << endl;
	
	cin.get(); cin.get();
	return 0;
}