#include<bits/stdc++.h>
using namespace std;
//ÅжÏÕâ¸öÊýÊDz»ÊÇÐÒÔËÊý×Ö
bool is_lucky(int num){
	int a[100000],j=0,m;//ÓÃÀ´´æ´¢¸÷¸öÊýλÊý¾Ý,ÊýµÄÊýλ 
	while(num!=0){
		a[j]=num%10;
		num=num/10;
		j++;
	}
//	cout<<j;

	for(int i=0;i<=j-1;i++){
		if(a[i]>=j){
			return false;
		}
		m=i;
		while(m+1!=j){
			if(a[i]==a[m+1]){
				return false;
			}
			m++;
		}
}
	
	return true;
}
int main(){
	int a,b,sum_=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(is_lucky(i)){
			sum_=sum_+1;
		}
	} 
	cout<<sum_;
	return 0;
}