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

bool check(int n)
{
	int t = n;
	int cnt = 0;
	while(t)
	{
		cnt++;
		t /= 10;
	}
	//cout << cnt << endl;
	bool f[1000] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
	t = n;
	while(t)
	{
		f[t % 10] = 1;
		t /= 10;
	}
	for(int i = 0; i < cnt; i++) if(!f[i]) return 0;
	return 1;
}
int cnt;

int main()
{
	int a, b;
	cin >> a >> b;
	//cout << check(a) << ' ' << check(b);
	for(int i = a; i <= b; i++)
	{
		if(check(i)) cnt++;
	}
	cout << cnt << endl;
	return 0;
 }