//¿ª long long £¡£¡£¡²»¿ª long long ¼û×æ×Ú£¡£¡£¡£¡£¡£¡£¡£¡£¡£¡ 
#include <bits/stdc++.h> 
using namespace std;

int vis[10];

void solve()
{
	int a,b,sum = 0;
	cin >> a >> b;
	for (int i = a;i <= b;i++)
	{
		memset(vis,0,sizeof vis);
		int j = i,num = 0;
		while (j)
		{
			vis[j%10]++;
			j /= 10;
			num++;
		}
		int flag = 1;
		for (int i = 0;i < num;i++)
			if (vis[i] != 1)
				flag = 0;
		sum += flag;
	}
	cout << sum;
}

int main()
{
	solve();
	return 0;
}
//rp++
//13:19