substitute

k = int(input())
l = int(input())
m = int(input())
n = int(input())
counter = 0
max_subs = False
for n1 in range(k, 9):
    if n1 % 2 == 0:
        for n2 in range(9, l - 1, -1):
            if n2 % 2 == 1:
                for n3 in range(m, 9):
                    if n3 % 2 == 0:
                        for n4 in range(9, n - 1, -1):
                            if n4 % 2 == 1:
                                if n1 == n3 and n2 == n4:
                                    print("Cannot change the same player.")
                                else:
                                    counter += 1
                                    print(f"{n1}{n2} - {n3}{n4}")
                                if counter == 6:
                                    max_subs = True
                                    break
                    if max_subs:
                        break
            if max_subs:
                break
    if max_subs:
        break