#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: huanghengyi
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/