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

int main(){
	int n;
	cin>>n;
	string a;
	string min;
	cin>>a;
	min=a;
	for(int i=2;i<=n;i++){
		cin>>a;
		if(min>a){
			min=a;
		}
	}
	cout<<min;
	return 0;
}

/**************************************************************
	Problem: 1480
	User: admin
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2076 kb
****************************************************************/