#include<bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	string s[n],min;
	for(int i=0;i<n;i++) cin>>s[i];
	min=s[0];
	for(int i=1;i<n;i++){
		if(min>s[i]) min=s[i];
	}
	cout<<min;
	return 0;
}

/**************************************************************
	Problem: 1480
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2076 kb
****************************************************************/