subs

k = int(input())
l = int(input())
m = int(input())
n = int(input())
counter = 0
max_subs = False
for first in range(k, 9):
    for second in range(9, l - 1, -1):
        for third in range(m, 9):
            for fourth in range(9, n - 1, -1):
                if first % 2 == 0 and third % 2 == 0:
                    if second % 2 == 1 and fourth % 2 == 1:
                        if second != fourth or first != third:
                            counter += 1
                            print(f'{first}{second} - {third}{fourth}')
                        else:
                            print("Cannot change the same player.")
                        if counter == 6:
                            max_subs = True
                            break
            if max_subs:
                break
        if max_subs:
            break
    if max_subs:
        break