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

bool check(int x) {
	string s = to_string(x);
	sort(&s[0],&s[0] + s.size());
	for (int i = 0;i < (int)s.size();i++) {
		if (s[i] - '0' != i) return 0;
	}
	return 1;
}

int main() {
	int a,b;
	cin >> a >> b;
	int ans = 0;
	for (int i = a;i <= b;i++) {
		if (check(i)) ans++;
	}
	cout << ans;
	return 0;
}