From_Chat

package Practice;

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;

        boolean firstFirstEven = true;
        boolean firstSecondOdd = true;
        boolean firstSecondEven = true;
        boolean secondSecondOdd = true;

        boolean areEqual = false;

        for (int i = k; i <= 8; i++) {
            for (int j = 9; j >= l; j--) {
                for (int o = m; o <= 8; o++) {
                    for (int p = 9; p >= n; p--) {
                        if (counter == 6) {
                            break;
                        }
                        if (i % 2 != 0) {
                            firstFirstEven = false;
                        } else {
                            firstFirstEven = true;
                        }
                        if (o % 2 != 0) {
                            firstSecondEven = false;
                        } else {
                            firstSecondEven = true;
                        }
                        if (j % 2 == 0) {
                            firstSecondOdd = false;
                        } else {
                            firstSecondOdd = true;
                        }
                        if (p % 2 == 0) {
                            secondSecondOdd = false;
                        } else {
                            secondSecondOdd = true;
                        }
                        if (i == o && j == p) {
                            areEqual = true;
                        } else {
                            areEqual = false;
                        }





                        if (firstFirstEven && firstSecondOdd && firstSecondEven && secondSecondOdd && !areEqual) {
                            System.out.printf("%d%d - %d%d%n",i, j, o, p);
                            counter++;
                        } else if (firstFirstEven && firstSecondOdd && firstSecondEven && secondSecondOdd && areEqual){
                            System.out.println("Cannot change the same player.");
                        }
                    }
                }
            }
        }
    }
}