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

int a, b, cnt, len, c[20]; 

bool check (int _) {
	len = 0;
	while (_)
		c[++len] = _ % 10, _ /= 10;
	sort(c + 1, c + len + 1);
	for (int i = 1; i <= len; i++)
		if (c[i] != i - 1)
			return false;
	return true;
}

int main () {
	scanf("%d%d", &a, &b);
	for (int i = a; i <= b; i++)
		if (check(i))
			cnt++;
	printf("%d\n", cnt);
	return 0;
}