NLMatrix

import java.util.Scanner;

public class Demo {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int a = Integer.parseInt(scanner.nextLine());
        int b = Integer.parseInt(scanner.nextLine());
        int c = Integer.parseInt(scanner.nextLine());
        int d = Integer.parseInt(scanner.nextLine());

        for (int i = a; i <= b; i++) {
            for (int j = a; j <= b; j++) {
                for (int k = c; k <= d; k++) {
                    for (int l = c; l <= d; l++) {
                        if ((i + l == j + k) && (i != j && k != l)){
                            System.out.printf("%d%d%n", i, j);
                            System.out.printf("%d%d%n", k, l);
                            System.out.println( );
                        }
                    }
                }
            }
        }

    }
}