#include <bits/stdc++.h>
using namespace std;
bool checkLuckyNumber(string a);
int main()
{
	int a, b, cnt;
	cin >> a >> b;
	for (int i = a; i <= b; i++)
	{
		if (checkLuckyNumber(string(i)))
		{
			cnt++;
		}
	}
	cout << cnt;
	return 0;
}
bool checkLuckyNumber(string a)
{
	const int b = strlen(a);
	bool flag = true;
	int c[b] = {0};
	for (int i = 0; i <= b - 1; i++)
	{
		if (a[i] == "0")
		{
			flag = false;
			break;
		}
		if (b - 1 < a[i])
		{
			flag = false;
			break;
		}
		c[a[i]]++;
	}
	for (int i = 0; i <= b - 1; i++)
	{
		if (!(c[i] == 1))
		{
			flag = false;
			break;
		}
	}
	if (flag)
	{
		return true;
	}
	else
	{
		return false;
	}
}