#include <bits/stdc++.h>

using namespace std;

int n, m, ans;
bool vis[1000005];

bool judge(int x) {
	memset(vis, false, sizeof(vis));
	int tmp = 0;
	while (x) {
		vis[x % 10] = true;
		x /= 10;
		tmp++;
	}
	for (int i = 0; i < tmp; i++) {
		if (!vis[i]) return false;
	}
	return true;
}

int main() {
	cin >> n >> m;
	for (int i = n; i <= m; i++) {
		if (judge(i)) ans++;
	}
	cout << ans;
	return 0;
}