#include <bits/stdc++.h>
using namespace std;
int main () {
	int a, b, ans = 0; cin >> a >> b;
	for (int i = a; i <= b; i++) {
		int new_i = i*1;
		string s = "";
		while (new_i != 0) {
			s += (new_i%10);
			new_i /= 10;
		}
		int n = s.size();
		sort (s.begin(), s.end()); ans++;
		for (int i = 0; i < n; i++) {
			if (s[i] != i) {
				ans--; break;
			}
		}
	}
	cout << ans << endl;
	return 0;
}