#include <bits/stdc++.h>
#define int long long
using namespace std;
int temp[15];

bool check(int n)
{
	memset(temp, 0, sizeof temp);
	int s = 0;
	while (n)
	{
		int k = n % 10;
		temp[k] = 1;
		n /= 10;
		s++;
	} 
	int cnt = 0;
	for (int i = 0; i < s; i++)
	{
		cnt += temp[i];
	} 
	return cnt == s;
} 

signed main()
{
	ios::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int a, b;
	cin >> a >> b;
	int ans = 0;
	for (int i = a; i <= b; i++)
	{
		ans += check(i);
	} 
	cout << ans;
	return 0;
}