#include <bits/stdc++.h>
using namespace std;
int ans = 0, l, r, f[10];
bool check(int a)
{
	int ws = 0;
	while(a != 0)
	{
		ws++;
		int x = a % 10;
		a /= 10;
		f[x] = 1;
	}
	for(int i = 0;i < ws;i++) if(f[i] == 0) return 0;
	return 1;
}
int main()
{
	cin >> l >> r;
	for(int i = l;i <= r;i++)
	{
		memset(f, 0, sizeof(f));
		if(check(i))
		{
			ans++;
		}
	}
	cout << ans;
	return 0;
}