#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    unsigned long long a, b, br = 0, s = 0, s9 = 0, tmp, tmp9;
    scanf("%lld%lld", &a, &b );
    a = a + 9 - (a % 9);
    b = b - b % 9;
    for(unsigned long long i = a; i <= b; i = i + 9 )
    {
            tmp = i;
            tmp9 = i * 9;
            while(tmp9 != 0)
            {
                s += tmp % 10;
                tmp /= 10;
                s9 += tmp9 % 10;
                tmp9 /= 10;
            }
            if( s == s9 )
                br++;
            s = 0;
            s9 = 0;
    }
    printf("%lld\n" ,br );
    return 0;
}