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

/**************************************************************
	Problem: 1480
	User: zhangziang
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/