import java.util.*;
public class Main{
    public static void main(String[] args)
    {
        Scanner sc=new Scanner(System.in);
        int n=sc.nextInt();
        if(n<=1)
        {
            System.out.print("Invalid input");
            return;
        }
        int arr[]=new int[n];
        for(int i=0;i<n;i++)
        {
            if(!sc.hasNextInt())
            {
                System.out.print("Invalid input");
                return;
            }
            arr[i]=sc.nextInt();
            if(arr[i]<=0)
        {
            System.out.print("Invalid input");
            return;
        }
        }
        int target=sc.nextInt();
        if(target<=0)
        {
            System.out.print("Invalid input");
            return;
        }
        for(int i=0;i<n;i++)
        {
            for(int j=i+1;j<n;j++)
            {
            if(target==arr[i]+arr[j])
            {
             System.out.print("("+arr[i]+','+" "+arr[j]+")");
             System.out.println();
            }
            }
        }
       if(target!=arr[i]+arr[j])
        {
            System.out.print("Invalid input");
            return;
        }
        
    }
}