#include<bits/stdc++.h>
#define ll long long

using namespace std;
ll a,b,ans;
bool check(ll x){
	bool book[15]={0};
	ll ws=0;
	while(x>0){
		ll y=x%10;
		x/=10;
		book[y]=1;
		ws++;
	}
//	for(int i=0;i<ws;i++){
//		cout<<book[i]<<" ";
//	}
	for(int i=0;i<ws;i++){
		if(book[i]==0){
			return 0;
		}
	}
	return 1;
}
int main(){
	cin>>a>>b;
	for(ll i=a;i<=b;i++){
		if(check(i)){
			ans++;
//			cout<<i<<"\n";
		}
	}
	cout<<ans;
	return 0;
}