nested loops exam basics

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