#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,i,min;
	string a[100],smin="z";
	cin>>n;
	for(i=0;i<n;i++){
		cin>>a[i];
		if(a[i]<smin){
			smin=a[i];
		}
	}
	cout<<smin;
	return 0;
}

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