subtitute

first = int(input())
second = int(input())
third = int(input())
forth = int(input())
combinations = 0
for k in range(first, 8):
    for p in range(9, second):
        for m in range(third, 8):
            for n in range(9, forth):
                if k == m & p == n & k % 2 == 0 & p % 2 != 0:
                    print("Cannot change the same player.")
                elif k % 2 == 0 & p % 2 != 0 & m % 2 == 0 & n % 2 != 0:
                    print(f"{k}{p} - {m}{n}")
                    combinations += 1
                if combinations == 6:
                    exit()