#include <bits/stdc++.h>
using namespace std;
bool f[15];

bool check(int n)
{
	for (int i = 0; i < n; i++)
		if (!f[i]) return 0;
	return 1;
}
int main()
{
	int n, m, cnt = 0;
	scanf("%d%d", &n, &m);
	for (int i = n; i <= m; i++)
	{
		memset(f, 0, sizeof f);
		int a = i, k = 0;
		while (a)
		{
			f[a % 10] = 1;
			a /= 10, k++;
		}
		if (check(k)) cnt++;
	}
	printf("%d\n", cnt);
	return 0;
}