import java.util.*;

class lengthyWordfromList

{

static public String longestWord(String words[])

{

Set<String> set=new HashSet<String>();

Arrays.sort(words);

String result="";

for(String word:words)

{

if(word.length()==1 || set.contains(word.substring(0,word.length()-1)))

{

if(word.length()>result.length())

{

result=word;

}

set.add(word);

}

}

return result;

}

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

int n=sc.nextInt();

String arr[]=new String[n];

for(int i=0;i<n;i++)

{

arr[i]=sc.next();

}

String x=longestWord(arr);

System.out.print("Answer: "+x);

}

}

// 7

// a

// banana

// app

// appl

// ap

// apply

// apple

// Answer: apple