#include <iostream>

using namespace std;

int sum_cifra_control(int,int);

int main()
{
    int a,b;
    cin>>a;
    cin>>b;
    cout<<sum_cifra_control(a,b);
    return 0;
}

int sum_cifra_control(int a,int b){
      int i,sum=0;
      for(i=a;i<=b;i++){
        if(i%9==a) sum++;
      }
      return sum;
}