#include <bits/stdc++.h>
using namespace std;
int a, b;
int main (){
	cin >> a >> b;
	int sum = 0;
	for (int i = a; i <= b; i++) {
		int a[10];
		memset (a, 0, sizeof (a));
		int t = i;
		int id = 0;
		while (t != 0) {
			id++;
			a[id] = t % 10;
			t = t / 10;
		}
		int b[10];
		memset (b, 0, sizeof (b));
		for (int i = 1; i <= id; i++)
			b[a[i]]++;
		bool f = true;
		for (int i = 0; i <= id - 1; i++) {
			if (b[i] != 1) {
				f = false;
				break;
			}
		}
		if (f == true)
			sum++;
	}
	cout << sum;
	return 0;
}