#include <bits/stdc++.h>
using namespace std;

int a, b, l = 0;
char s[20];

int main() {
	scanf("%d%d", &a, &b);
	int ans = 0;
	for (int i = a; i <= b; i++) {
		int k = i;
		while (k) {
			s[++l] = (k % 10) - '0';
			k /= 10;
		}
		sort(s + 1, s + l + 1);
		bool f = true;
		for (int i = 1; i <= l; i++)
			if (s[i] != i - 1 - '0') {
				f = false;
				break;
			}
		if (f)
			ans++;	
		l = 0;
	}
	printf("%d\n", ans);
	return 0;
}