#include <bits/stdc++.h>
using namespace std;
bool ff[10];
bool f(int n)
{
	int w = 0, c = n;
	while (c)
		c /= 10, w++;
	for (int i = 0; i < w; i++)
		ff[i] = 0;
	while (n)
	{
		ff[n % 10]++;
		n /= 10;
	}
	for (int i = 0; i < w; i++)
		if (!ff[i])
			return 0;
	return 1;
}
int main()
{
	int a, b, ans = 0;
	cin >> a >> b;
	for (int i = a; i <= b; i++)
		ans += f(i);
	cout << ans;
	return 0;
}