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

int a[1000005];

void work()
{
	for (int i = 1; i <= 1000005; i++)
	{
		if (a[i] != 0) a[i] = 0;
		else return ;
	}
		
}

bool check(int x)
{
	work();
	int cnt = 0;
	while (x)
	{
		int g = x % 10;
		x /= 10;
		a[++cnt] = g;
	}
	if (a[cnt] == 0) return 0;
	sort(a + 1, a + cnt + 1);
	for (int i = 1; i <= cnt; i++)
		if (a[i] != i - 1) return 0;
	return 1;
}

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int l, r, ans = 0;
	cin >> l >> r;
	for (int i = l; i <= r; i++)
		if (check(i)) ans++;
	cout << ans << "\n";
	return 0;
}