#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<string>
#include<string.h>
using namespace std;

#define NMAX 105

long long ans, a, b;
int N, nr_cif, cifre[NMAX];

int numCif(long long val) {
    if(!val)
        return 0;
    cifre[++nr_cif] = val % 10;
    return numCif(val / 10) + 1;
}

long long rid_log(int a, int b) {
    long long ans = 1;
    for(int i = 1; i <= b; i++)
        ans = ans * a;
    return ans;
}

int main () {
   // freopen("a.in","r",stdin);
   // freopen("a.out","w",stdout);

    scanf("%lld%lld",&a,&b);
    b--;
    if(b < 10) {
        printf("%lld\n", b - a + 1);
        return 0;
    }

    if(a > 9) {
        printf("0\n");
        return 0;
    }
    int N = numCif(b);
    reverse(cifre + 1, cifre + N + 1);

    long long ans = 10 - a;
    for(int i = 2; i < N; i++) {
        ans += rid_log(10 - a, i);
    }
    //printf("%lld %d\n", ans, N);
    for(int i = 1; i <= N; i++) {
        if(cifre[i] < a) {
            ans--;
            break;
        }
        ans += ((long long)cifre[i] - a) * rid_log(10 - a, N - i);
    }

    printf("%lld\n", ans + 1);

    return 0;
}