numbers_list = [1, 5, 2, 4, 9, 12, 3, 6, 17, 20]
min_num = None
max_num = None

for num in numbers_list:
    if not min_num and not max_num:
        min_num = num
        max_num = num

    if min_num > num:
        min_num = num

    if max_num < num:
        max_num = num

print(min_num, max_num)