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

int weishu(int p)
{
	int x = p;
	int sum = 0;
	while (x != 0)
	{
		x /= 10;
		sum++;
	}
	return sum;
}
bool shuzi(int n)
{
	int book[10] = {0,0,0,0,0,0,0,0,0,0};
	int t = n;
	for (int i = 1;i <= weishu(n);i++)
	{
		int x = t % 10;
		t /= 10;
		book[x] = 1;
	}
	for (int i = 0;i <= weishu(n) - 1;i++)
	{
		if(book[i] == 0) return false;
	}
	return true;
}
int main()
{
	int a,b,sum = 0;
	cin >> a >> b;
	for (int i = a;i <= b;i++)
	{
		if(shuzi(i))
		{
			sum++;
		} 
	}
	cout << sum;
	
	return 0;
}