​

using System;

public class Program

{

    public static void Main()

    {

                    int[] sample = new int[10];

            int i;

            for (i = 0; i < 5; i = i + 1)

            {          sample[i] = Convert.ToInt32(Console.ReadLine());}

            int sum = 0;

            for ( i = 0; i <5; i++)

            {for(int j=i+1;j<5;j++)

            {if(sample[i] == sample[j]) 

              Console.WriteLine( sample[i]);}

            }  

        }

​

​

    }

​