k = int(input())
l = int(input())
m = int(input())
n = int(input())

counter = 0

for num_k in range(k, 9):
    if counter == 6:
        break
    for num_l in range(9, l - 1, -1):
        if counter == 6:
            break
        for num_m in range(m, 9):
            if counter == 6:
                break
            for num_n in range(9, n - 1, -1):
                if num_k % 2 == 0 and num_m % 2 == 0 and num_l % 2 == 1 and num_n % 2 == 1:
                    first_player = f'{num_k}{num_l}'
                    second_player = f'{num_m}{num_n}'
                    if first_player != second_player:
                        print(f'{first_player} - {second_player}')
                        counter += 1
                        if counter == 6:
                            break
                    else:
                        print("Cannot change the same player.")