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

int main()
{
	int a,b;
	cin >> a >> b;
	int cnt = 0;
	for(int i = a;i <= b;i ++)
	{
		int s[60];
		memset(s,0,sizeof(s));
		int t = i;
		int weishu = 0;
		while(t != 0)
		{
			int wei = t % 10;
			weishu ++;
			s[wei] ++;
			t /= 10;
		}
		int f = 1;
		for(int k = 0;k < weishu;k ++)
		{
			if(s[k] == 0)
			{
				f = 0;
				break;
			}
		}
		if(f == 1)
		{
			cnt ++;
		}
	}
	cout << cnt;
	return 0;
}