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

int main()
{
	int n,m,cnt = 0;
	cin >> n >> m;
	for (int i = n;i<=m;i++)
	{
		int m = i,s = 0,a[10];
		bool f = true;
		memset(a,0,sizeof(a));
		while (m)
		{
			m /= 10;
			s++;
		}
		m = i;
		while (m)
		{
			int g = m%10;
			a[g]++;
			m /= 10;
		}
		for (int i = 0;i<=9;i++)
		{
			if (a[i] == 0 && i < s || i >= s && a[i] > 0)
			{
				f = false;
				break;
			}
		}
		if (f == true)
		{
			cnt++;
		}
	}
	cout << cnt;
	return 0;
}