#include <bits/stdc++.h>
using namespace std;
int ans;
int main(){
	int a, b;
	cin >> a >> b;
	for (int i=a; i<=b; i++){
		int now = i, p[10], j = 0;
		while (now != 0){
			p[j++] = now % 10;
			now /= 10;
		}
		j-=1;
		sort(p, p+j+1);
		bool flag = false;
		for (int k = 0; k <= j; k++){
			if (p[k] != k){
				flag = true;
				break;
			} 
		}
		if (flag == false) ans++;
	}
	cout << ans;
	return 0;
}