#include<iostream>
using namespace std;
int sum(long long a)
{
    int ret=0;
    while(a!=0)
    {
        ret += a%10;
        a /= 10;
    }
    return ret;
}
int main()
{
    long long a = 0,b = 0;
    long long otg = 0; 
    cin>>a>>b;
    a=a+9-(a%9);
    for(long long i = a; i <= b; i+=9)
    {
        if(sum(i)==sum(9*i))
        {
            otg ++;
        }
    }
    cout << otg << endl;
}