#include <bits/stdc++.h>
using namespace std;
int a, b;
int cur;
bool vis[10];

int main() {
	// freopen("p1.in", "r", stdin);
	// freopen("p1.out", "w", stdout);
	cin >> a >> b;
	for (int i = a; i <= b; i++) {
		int tmp = i, t = i;
		int n = 0;
		while (tmp) {
			tmp /= 10;
			n++;
		}
		memset(vis, false, sizeof vis);
		while (t) {
			vis[t % 10] = true;
			t /= 10;
		}
		bool flg = true;
		for (int i = 0; i < n; i++) {
			if (!vis[i]) {
				flg = false;
				break;
			}
		}
		cur += flg;
	}
	cout << cur;
	return 0;
}