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

bool check(int n)
{
	int a[11],cnt = 0;
	int r = n;
	memset(a,0,sizeof(a));
	while (n != 0)
	{
		int g = n % 10;
		a[g] ++;
		cnt ++;
		n /= 10;
	}
	for (int i = 0;i < cnt;i ++)
	{
		if (a[i] == 0)
		{
			return false;
		}
	}
	return true;
}

int main()
{
	int n,m;
	cin >> n >> m;
	int sum = 0;
	for (int i = n;i <= m;i ++)
	{
		if (check(i) == true)
		{
			sum ++;
		}
	}
	cout << sum;
    return 0;
}