#include <bits/stdc++.h>
using namespace std;
int a, b, cnt;
int len(int n)
{
	int res = 0;
	while (n) n /= 10, ++res;
	return res; 
}
bool check(int n)
{
	int l = len(n);
	vector<bool> right(10), num(10);
	for (int i = 0; i < l; ++i) right[i] = 1;
	while (n)
	{
		num[n % 10] = 1;
		n /= 10;
	}
	for (int i = 0; i < l; ++i)
	{
		if (right[i] != num[i]) return 0;
	}
	return 1;
}
int main()
{
	scanf("%d%d", &a, &b);
	for (int i = a; i <= b; ++i)
	{
		if (check(i))
		{
			++cnt;
			//cerr << i << endl;
		}
	}
	printf("%d\n", cnt);
	return 0;
}