StuckNumbers

import java.util.Arrays;
import java.util.InputMismatchException;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;


public class P_20140106_StuckNumbers {

    public static void main(String[] args) {

        try(Scanner input  = new Scanner(System.in);) {
            int num = Integer.parseInt(input.nextLine());
            String[] inputNumbers = input.nextLine().split(" ");

            Boolean isTrue = false;
            for (int i = 0; i < inputNumbers.length; i++) {
                for (int j = 0; j < inputNumbers.length; j++) {
                    for (int i1 = 0; i1 < inputNumbers.length; i1++) {
                        for (int j1 = 0; j1 < inputNumbers.length; j1++) {
                            if ((i != j && i != i1 && i != j1)
                                && ( j != j1 && j != i1)
                                && (i1 != j1)){
                                if ((inputNumbers[i]+inputNumbers[j])
                                        .equals(inputNumbers[i1]+inputNumbers[j1])) {
                                    System.out.printf("%s|%s==%s|%s",inputNumbers[i],inputNumbers[j]
                                    ,inputNumbers[i1],inputNumbers[j1]);
                                    System.out.println();
                                    isTrue = true;
                                }

                            }
                        }
                    }
                }
            }
            if (!isTrue) {
                System.out.println("No");
            }
        } catch (InputMismatchException e) {
            System.out.println(e);
        }

    }

}