#include <bits/stdc++.h> 
using namespace std;
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bool check(int n)
{
	bool flag[100005] = {};
	int len = 0;
	while(n != 0)
	{
		flag[(n % 10)] = true;
		len++;
		n /= 10;
	}
	for(int i = 0; i <= len-1; i++)
	{
		if(flag[i] == false)
		{
			return false;
		}
	}
	return true;
}
int main()
{
	int a, b;
	cin >> a >> b;
	int ans = 0;
	for(int i = a; i <= b; i++)
	{
		if(check(i) == true)
		{
			ans++;
		}
	}
	cout << ans;
	return 0;	
}