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

int lister[7] = {11,11,11,11,11,11,11};

bool check(int num){
	for (int x = 0;x<7;x++){
		if (lister[x] == num){
			return false;
		}
	} 
	return true;
}
int main(){
	int a,b,tmp,now,loopnum,shuwei,tmp2;
	cin >> a>>b;
	int sum = 0;
	for (int x = a;x<=b;x++){
		tmp = x;
		tmp2 = x;
		loopnum = 0;
		shuwei = 0;
		sum++;
		while (tmp2 > 0){
			tmp2 /=10;
			shuwei++;
		}
		while (tmp > 0){
			now = tmp%10;

			if (check(now) && now < shuwei){
				lister[loopnum] = now;
				tmp/=10;
				loopnum++;
			}else{
				sum--;
			
				break;	
				
			}
			
		}
		for (int y = 0;y<7;y++) lister[y] = 11;
		
	}
	cout << sum;
}