#include<bits/stdc++.h>
using namespace std;
int a, b, sum = 0, sum1 = 0, sum2 = 0, sum3 = 0;
int main () {
	cin >> a >> b;
	for (int i = a; i <= b; i++) {
		for (int k = i; k > 0; k/=10) {
			if (sum3 == 0) {
				sum1 += k % 10; 
				sum3 = 1;
			}
			else {
				sum2 += k % 10;
				sum3 = 0;
			}
		}
		if (sum1 == sum2) 
		    sum++;	
	}
	cout << sum << endl;
	return 0;
}