#include<iostream>
#include<algorithm>
#include<string>
#include<stack>
#include<cstdio>
#include<cmath>
using namespace std;
long long a,b,sum,i,a1,sum1,br;
int main()
{
    cin>>a>>b;
    for(i=a;i<=b;i++)
    {
        sum1=0;
        sum=0;
        a1=i;
        for(;;)
        {
            if(a1==0)break;
            sum=sum+a1%10;
            a1=a1/10;            
        }
        a1=i*9;
        for(;;)
        {
            if(a1==0)break;
            sum1=sum1+a1%10;
            a1=a1/10;            
        }
        if(sum1==sum){break;}
    }
    for(i=i;i<=b;i+=9)
    {
        sum1=0;
        sum=0;
        a1=i;
        for(;;)
        {
            if(a1==0)break;
            sum=sum+a1%10;
            a1=a1/10;            
        }
        a1=i*9;
        for(;;)
        {
            if(a1==0)break;
            sum1=sum1+a1%10;
            a1=a1/10;            
        }
        if(sum1==sum)br++;
    }
        cout<<br<<endl;
    return 0;
}