Exam 1. Stuck Numbers

import java.util.Scanner;

public class _1_StuckNumbers {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        int count = scan.nextInt();

        int[] numbers = new int[count];
        for (int i = 0; i < numbers.length; i++) {
            numbers[i] = scan.nextInt();
        }

        boolean isFoundStuckNumbers = false;
        String leftStr, rightStr;
        for (int a : numbers) {
            for (int b : numbers) {
                if (b != a) {
                    for (int c : numbers) {
                        if (c != a && c != b) {
                            for (int d : numbers) {
                                if (d != a && d != b && d != c) {
                                    leftStr = "" + a + b;
                                    rightStr = "" + c + d;
                                    if (leftStr.equals(rightStr)) {
                                        isFoundStuckNumbers = true;
                                        System.out.printf("%d|%d==%d|%d%n", a, b, c, d);
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

        if (!isFoundStuckNumbers) {
            System.out.println("No");
        }
    }

}