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

bool check(int x)
{
	int cnt = 0;
	int vis[20];
	for(int i = 0; i <= 10; i++)
		vis[i] = 0;
	while(x != 0)
	{
		if(vis[x % 10] == 1) return 0;
		vis[x % 10] = 1;
		x /= 10;
		cnt++;
	}
	for(int i = 0; i <= 10; i++)
		if((i < cnt && vis[i] == 0) || (i >= cnt && vis[i] == 1)) return 0;		
	return 1;
}

int main()
{
	int l, r, c = 0;
	cin >> l >> r;
	for(int i = l; i <= r; i++)
		if(check(i) == 1) c++;	
	cout << c << endl;
	return 0;
}