#include<iostream>
using namespace std;
int main()
{
    long long a=9,br=0,br1=0,p=9,i1,i2,c=0;
    cin>>i1>>i2;
    p=i1+9-i1%9;
    for(long long i=p;i<=i2;i+=9)
    {
        br=0;
        br1=0;
        a=i;
        while(a)
        {
            br+=a%10;
            a/=10;
        }
        a=i;
        a*=9;
        while(a)
        {
            br1+=a%10;
            a/=10;
        }
        if(br1==br) c++;
    }
    cout<<c<<endl;
    return 0;
}