06. Substitute

k_num = int(input())
l_num = int(input())
m_num = int(input())
n_num = int(input())

valid_count = 0

for k in range(k_num, 9):
    if k % 2: continue
    for l in range(9, l_num - 1, -1):
        if l % 2 == 0: continue
        for m in range(m_num, 9):
            if m % 2: continue
            for n in range(9, n_num - 1, -1):
                if n % 2 == 0: continue
                if k == m and l == n:
                    print("Cannot change the same player.")
                else:
                    print(f"{k}{l} - {m}{n}")
                    valid_count += 1
                    if valid_count == 6:
                        exit()