#include<bits/stdc++.h>
using namespace std;
int main(){
	string s[99],min;
	int n,i;
	cin>>n;
	cin>>s[0];
	min=s[0];
	for(int i=1;i<n;i++){
		cin>>s[i];
		if(s[i]<min) min=s[i];		
	}
	cout<<min;
return 0;}
/**************************************************************
	Problem: 1480
	User: fzy001
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/