#include <bits/stdc++.h>
using namespace std;
 int main(){
    int n;
    string a,min;
    cin>>n;
    cin>>a;
    min=a;
    for(int i=2;i<=n;i++){
        cin>>a;
        if(min>a){
            min=a;
        }
    }
    cout<<min;
    return 0;
}
/**************************************************************
	Problem: 1480
	User: xuanhua
	Language: C++
	Result: Accepted
	Time:6 ms
	Memory:2076 kb
****************************************************************/