/******************************************************************************
Online Java Compiler.
Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.
*******************************************************************************/
import java.util.*;
public class Main
{
public void duplicate(int n, int k[]) {
for(int i=0; i<n; i++){
for(int j=i+1; j<n; j++){
if(k[i]==k[j]){
System.out.println(k[i]);
}
}
}
}
public static void main(String[] args) {
Scanner scan =new Scanner(System.in);
int n=scan.nextInt();
int k[]= new int [n];
for(int i=0; i<n; i++){
k[i]=scan.nextInt();
}
Main method = new Main();
method.duplicate(n,k);
}
}
