#include <bits/stdc++.h>
using namespace std;
#define int long long
int a, b, ans;
int t[10];

bool check(int x)
{
	for (int i = 0; i <= 9; i++)
		t[i] = 0;
	int cnt = 0;
	while (x){
		t[x % 10]++;
		x /= 10;
		cnt++;
	}
	for (int i = 0; i < cnt; i++)
		if (t[i] != 1)
			return false;
	return true;
}

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