starting_interval_first_number_from_number_one = int(input())
starting_interval_second_number_from_number_one = int(input())
starting_interval_first_number_from_number_two = int(input())
starting_interval_second_number_from_number_two = int(input())
number_of_changes = 0
condition = False

#   Дефинираме си всички for проверки една под друга, без ифове, тъй като за да продължи нататък, трябва да е в зададените  #   граници. След това си извършваме вътре проверките.

for first in range(starting_interval_first_number_from_number_one, 8 + 1):
    for second in range(9, starting_interval_second_number_from_number_one - 1, -1):
        for third in range(starting_interval_first_number_from_number_two, 8 + 1):
            for forth in range(9, starting_interval_second_number_from_number_two - 1, -1):

                if first % 2 == 0 and second % 2 != 0 and third % 2 == 0 and forth % 2 != 0:
                    if first == third and second == forth:
                        print('Cannot change the same player.')
                    else:
                        print(f'{first}{second} - {third}{forth}')
                        number_of_changes += 1

                    if number_of_changes == 6:
                        condition = True
                        break
            if condition:
                break
        if condition:
            break
    if condition:
        break