#include<bits/stdc++.h> 
using namespace std;
int a,b;
int check(int n){
	int i2=1,wei[8]={0},ch[8]={0};	
	while(n){
		  wei[i2]=n%10;
		  ch[i2]=i2-1;
		  i2++;	
		  n=n/10;  
	}
	for(int i3=1;i3<=i2-1;i3++){
		bool p=false;
		for(int j=1;j<=i2-1;j++){
			if(wei[i3]==ch[j]){
			   ch[j]=-1;
			   p=true;
			}
		}
		if(p==false)return 0;
	}
	return 1;
}
int main(){
	long cnt=0;
	cin>>a>>b;
	for(int i=a;i<=b;i++){
		if(check(i))cnt++;
	}
	cout<<cnt<<endl;
	return 0;
}