substitute

k = int(input())
l = int(input())
m = int(input())
n = int(input())
counter = 0
max_subs = False
for n1 in range(k, 9): # 8
    for n2 in range(9, l - 1, -1): # 9
        for n3 in range(m, 9):
            for n4 in range(9, n - 1, -1):
                if n1 % 2 == 0 and n2 % 2 == 1 and n3 % 2 == 0 and n4 % 2 == 1:
                    if f'{n1}{n2}' == f'{n3}{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