exam basics nested looping

k = int(input())
l = int(input())
m = int(input())
n = int(input())
counter_subs = 0
all_printed = False
for num1 in range(k, 9):
    for num2 in range(9, l - 1, -1):
        for num3 in range(m, 9):
            for num4 in range(9, n - 1, -1):
                if num1 % 2 == 0 and num3 % 2 == 0 and num2 % 2 != 0 and num4 % 2 != 0:
                    if num1 == num3 and num2 == num4:
                        print(f"Cannot change the same player.")
                        continue
                    else:
                        print(f"{num1}{num2} - {num3}{num4}")
                        counter_subs += 1
                        if counter_subs == 6:
                            all_printed = True
                            break