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

int main()
{
	int a, b, ans2 = 0;
	cin >> a >> b;
	for (int i = a; i <= b; i++)
	{
		int x[7] = {0, 1, 2, 3, 4, 5, 6};
		int j = i;
		int len = 0;
		while (j)
		{
			len++;
			x[j % 10] = -1;
			j /= 10;
		}
		int ans = 0;
		for (int z = 0; z < len; z++)
		{
			if (x[z] == -1) ans++;
		}
		if (ans == len) ans2++;
	}
	cout << ans2;
	return 0;
 }