#include <bits/stdc++.h>
#define lld long long
#define ff(i,a,b) for(long long i=a; i<=b; i++)
using namespace std;

lld prec[501] = {0,28000000,58000000,90000000,124000000,160000000,189000000,220000000,253000000,288000000,325000000,355000000,387000000,421000000,457000000,495000000,526000000,559000000,594000000,631000000,670000000,702000000,736000000,772000000,810000000,850000000,883000000,918000000,955000000,994000000,1035000000,1069000000,1105000000,1143000000,1183000000,1225000000,1260000000,1297000000,1336000000,1377000000,1420000000,1456000000,1494000000,1534000000,1576000000,1620000000,1657000000,1696000000,1737000000,1780000000,1825000000,1854000000,1885000000,1918000000,1953000000,1990000000,2020000000,2052000000,2086000000,2122000000,2160000000,2191000000,2224000000,2259000000,2296000000,2335000000,2367000000,2401000000,2437000000,2475000000,2515000000,2548000000,2583000000,2620000000,2659000000,2700000000,2734000000,2770000000,2808000000,2848000000,2890000000,2925000000,2962000000,3001000000,3042000000,3085000000,3121000000,3159000000,3199000000,3241000000,3285000000,3322000000,3361000000,3402000000,3445000000,3490000000,3528000000,3568000000,3610000000,3654000000,3700000000,3730000000,3762000000,3796000000,3832000000,3870000000,3901000000,3934000000,3969000000,4006000000,4045000000,4077000000,4111000000,4147000000,4185000000,4225000000,4258000000,4293000000,4330000000,4369000000,4410000000,4444000000,4480000000,4518000000,4558000000,4600000000,4635000000,4672000000,4711000000,4752000000,4795000000,4831000000,4869000000,4909000000,4951000000,4995000000,5032000000,5071000000,5112000000,5155000000,5200000000,5238000000,5278000000,5320000000,5364000000,5410000000,5449000000,5490000000,5533000000,5578000000,5625000000,5656000000,5689000000,5724000000,5761000000,5800000000,5832000000,5866000000,5902000000,5940000000,5980000000,6013000000,6048000000,6085000000,6124000000,6165000000,6199000000,6235000000,6273000000,6313000000,6355000000,6390000000,6427000000,6466000000,6507000000,6550000000,6586000000,6624000000,6664000000,6706000000,6750000000,6787000000,6826000000,6867000000,6910000000,6955000000,6993000000,7033000000,7075000000,7119000000,7165000000,7204000000,7245000000,7288000000,7333000000,7380000000,7420000000,7462000000,7506000000,7552000000,7600000000,7632000000,7666000000,7702000000,7740000000,7780000000,7813000000,7848000000,7885000000,7924000000,7965000000,7999000000,8035000000,8073000000,8113000000,8155000000,8190000000,8227000000,8266000000,8307000000,8350000000,8386000000,8424000000,8464000000,8506000000,8550000000,8587000000,8626000000,8667000000,8710000000,8755000000,8793000000,8833000000,8875000000,8919000000,8965000000,9004000000,9045000000,9088000000,9133000000,9180000000,9220000000,9262000000,9306000000,9352000000,9400000000,9441000000,9484000000,9529000000,9576000000,9625000000,9658000000,9693000000,9730000000,9769000000,9810000000,9844000000,9880000000,9918000000,9958000000,10000000000,10035000000,10072000000,10111000000,10152000000,10195000000,10231000000,10269000000,10309000000,10351000000,10395000000,10432000000,10471000000,10512000000,10555000000,10600000000,10638000000,10678000000,10720000000,10764000000,10810000000,10849000000,10890000000,10933000000,10978000000,11025000000,11065000000,11107000000,11151000000,11197000000,11245000000,11286000000,11329000000,11374000000,11421000000,11470000000,11512000000,11556000000,11602000000,11650000000,11700000000,11734000000,11770000000,11808000000,11848000000,11890000000,11925000000,11962000000,12001000000,12042000000,12085000000,12121000000,12159000000,12199000000,12241000000,12285000000,12322000000,12361000000,12402000000,12445000000,12490000000,12528000000,12568000000,12610000000,12654000000,12700000000,12739000000,12780000000,12823000000,12868000000,12915000000,12955000000,12997000000,13041000000,13087000000,13135000000,13176000000,13219000000,13264000000,13311000000,13360000000,13402000000,13446000000,13492000000,13540000000,13590000000,13633000000,13678000000,13725000000,13774000000,13825000000,13860000000,13897000000,13936000000,13977000000,14020000000,14056000000,14094000000,14134000000,14176000000,14220000000,14257000000,14296000000,14337000000,14380000000,14425000000,14463000000,14503000000,14545000000,14589000000,14635000000,14674000000,14715000000,14758000000,14803000000,14850000000,14890000000,14932000000,14976000000,15022000000,15070000000,15111000000,15154000000,15199000000,15246000000,15295000000,15337000000,15381000000,15427000000,15475000000,15525000000,15568000000,15613000000,15660000000,15709000000,15760000000,15804000000,15850000000,15898000000,15948000000,16000000000,16036000000,16074000000,16114000000,16156000000,16200000000,16237000000,16276000000,16317000000,16360000000,16405000000,16443000000,16483000000,16525000000,16569000000,16615000000,16654000000,16695000000,16738000000,16783000000,16830000000,16870000000,16912000000,16956000000,17002000000,17050000000,17091000000,17134000000,17179000000,17226000000,17275000000,17317000000,17361000000,17407000000,17455000000,17505000000,17548000000,17593000000,17640000000,17689000000,17740000000,17784000000,17830000000,17878000000,17928000000,17980000000,18025000000,18072000000,18121000000,18172000000,18225000000,18262000000,18301000000,18342000000,18385000000,18430000000,18468000000,18508000000,18550000000,18594000000,18640000000,18679000000,18720000000,18763000000,18808000000,18855000000,18895000000,18937000000,18981000000,19027000000,19075000000,19116000000,19159000000,19204000000,19251000000,19300000000,19342000000,19386000000,19432000000,19480000000,19530000000,19573000000,19618000000,19665000000,19714000000,19765000000,19809000000,19855000000,19903000000,19953000000,20005000000,20050000000,20097000000,20146000000,20197000000,20250000000,20296000000,20344000000,20394000000,20446000000,20500000000};
inline lld S(lld x)
{
    return (x==0) ? 0 : ((x%10) + S(x/10));
}
lld getRes(lld x)
{
    lld ret = prec[x / 2000000]; // x
    lld dff = x % 2000000; // x
    lld newX = (x / 2000000) * 2000000; // 0
    ff(i, newX + 1, newX + dff)
    {
        if(i & 1)
            ret += S(i);
    }
    return ret;
}

lld a, b;

int main()
{
    scanf("%lld %lld", &a, &b);
    printf("%lld\n", getRes(b) - getRes(a-1));
    return 0;
}