#include <bits/stdc++.h>
using namespace std;
int main(){
	string s,s1;
	cin>>s>>s1;
	cout<<s[0];
	int i=1;
	while(true){
		if(s[i]-'0'<s1[0])cout<<s[i++];
		else {cout<<s[i]<<s1[0]<<endl;break;}
	}
	return 0;
}

(悲