using System;
public class Program
{
public static void Main()
int[] n = new int[10];
for (int i = 0; i < 10; i++)
n[i] = Convert.ToInt32(Console.ReadLine());
}
for (int rtx = 0; rtx < 10; rtx ++)
if (n[rtx] == n[i])
if(rtx!=i)
Console.WriteLine(n[rtx]);