#include<bits/stdc++.h>
using namespace std;
int main(){
    string s1,mi;
    int n;
    cin>>n;
    cin>>mi;
    for(int i=1;i<n;i++){
        cin>>s1;
        if (mi>s1){
            mi=s1;
        }
    }
    cout<<mi;
}
/**************************************************************
	Problem: 1480
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2076 kb
****************************************************************/