#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,j,sum=0,k=0,h=0;

    while(b>=a){
        j=b;
        while(j){
            k+=j%10;
            j=j/10;
        }
        if(k==a) sum++;
        else if(k>=10){
                while(k){
                    h=h+k%10;
                    k=k/10;
                }
                if(h==a) sum++;
            }
        b--;
        k=0;
        h=0;
    }
    return sum;
}