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

int count_size(int x) {
	int size = 0;
	while (x) {
		x /= 10;
		size++;
	}
	return size;
}

int main() {
	int a, b, sum = 0, check[7] = {0, 0, 0, 0, 0, 0, 0};
	bool flag;
	scanf("%d %d", &a, &b);
	for (int i = a; i <= b; i++) {
		int n = count_size(i), temp = i;
		memset(check, 0, sizeof(check));
		flag = true;
		while (temp) {
			check[temp % 10] = 1;
			temp /= 10;
		}
		for (int i = 0; i < n; i++) {
			if (!check[i]) {
				flag = false;
				break;
			}
		}
		if (flag) {
			sum++;
		}
	}
	printf("%d", sum);
	return 0;
}