更正 ELIF 语句产生语法错误 python 3.6.2

使用 IF、ELIF 语句让用户选择排序算法对输入的列表进行排序。Elif 不断返回语法错误，但我不明白为什么。据我所知，它已正确缩进，存在冒号，并且我知道没有其他语法错误。

代码：

if response == ("bubble"):
    bubble(numbers)
elif response == ("insertion"):
    insertion(numbers)
elif response == ("merge"):
    merge(numbers)
elif response == ("quick"):
    quick(numbers)
else:
    print("incorrect response")

MCVE：

numbers = [int(x) for x in input("input your list ").split()]
response = input(what algorithm, ")
    if response == ("bubble"):
        bubble(numbers)
    elif response == ("insertion"):
        insertion(numbers)
    elif response == ("merge"):
        merge(numbers)
    elif response == ("quick"):
        quick(numbers)
    else:
        print("incorrect response")

（我的其余代码只是四种排序算法，我认为它们不相关，如果它们是注释，我将对其进行编辑。