import java.util.Scanner;

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

        int k = Integer.parseInt(scanner.nextLine());
        int l = Integer.parseInt(scanner.nextLine());
        int m = Integer.parseInt(scanner.nextLine());
        int n = Integer.parseInt(scanner.nextLine());

        int counter = 0;

        for (int i = k; i <= 8; i++) {
            for (int j = 9; j >= l; j--) {
                for (int h = m; h <= 8; h++) {
                    for (int g = 9; g >= n; g--) {
                        if (i % 2 == 0 && j % 2 == 1 && h % 2 == 0 && g % 2 == 1){
                            if (counter == 6) {
                                return;
                            }

                            if (i == h && j == g) {
                                System.out.println("Cannot change the same player.");
                            } else {
                                counter++;
                                System.out.printf("%d%d - %d%d\n", i, j, h, g);

                            }

                        }

                    }

                }

            }
        }
    }
}