题解 | #句子逆序#

def allcontain(x):
    for char in x:
        if not (char.isalpha() or char.isspace()): #一开始写成了x.isalpha导致判断错误
            return False
    return True

while True:
    try:
        y = input()
        if allcontain(y):
            z = y.split(' ')
            i = len(z) - 1  #一开始这里写成了len(z)，导致程序错误
            newlist = []
            while i >= 0:
                newlist.append(z[i])
                i -= 1
                if i == -1:  # 修正条件
                    break
            for element in newlist:
                print(element, end=' ')
        else:
            break
    except:
        break