#include<iostream>
#include<string.h>
#include<algorithm>
#include<vector>
#include<math.h>
#include<iomanip>
using namespace std;
int main()
{
    long long a,b,count=0;
    cin>>a>>b;
    for(long long i=a;i<=b;i++)
    {
        long long sum1=0,sum2=0;
        string s=to_string(i);
        for(long long j=0;j<s.length();j=j+2)
            sum1+=(int)s[j];
        for(long long j=1;j<s.length();j=j+2)
            sum2+=(int)s[j];
            if(sum1==sum2)
                count++;
    }
    cout<<count;
    return 0;
}