#include<iostream>
using namespace std;
int main()
{
    long long a,b,br=0;
    cin>>a>>b;
    if (a%9!=0)
        a+=9-(a%9);
    for (long long i=a; i<=b; i+=9)
    {
        long long z=i*9,i1=i,s1=0,s2=0;
        while (z!=0)
        {
            s1+=z%10;
            z=z/10;
        }
        while (i1!=0)
        {
            s2+=i1%10;
            i1/=10;
        }
        if (s1==s2)
            br++;
    }
    cout<<br<<endl;
    return 0;
}