#include<iostream>
using namespace std;
unsigned long long Suma(unsigned long long t)
{
    unsigned long long s=0,k;
    k=t;
    while(k)
    {
        s=s+k%10;
        k=k/10;
    }
    return s;
}
int main()
{
    unsigned long long i,a,b;
    unsigned long long br=0;
    cin>>a>>b;
    a=a*9;
    for(i=b*9;i>=a;i-=9)
    {
            if(Suma(i)==Suma(i/9)) br++;
    }
    cout<<br<<endl;
    return 0;
}
