ProgBasicsExam28and29July2018-E06substitute

import java.util.Scanner;

public class E06substitute {
    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 substitute = 0;

        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 (i % 2 != 0 || o % 2 != 0 || j % 2 == 0 || p % 2 == 0) {
                            continue;
                        } else if (i == o && j == p){
                            System.out.println("Cannot change the same player.");
                        } else {
                            substitute++;
                            System.out.println("" + i + j + " - " + o + p);
                        }

                        if (substitute >= 6){
                            return;
                        }
                    }
                }
            }
        }
    }
}