题解 | #单词倒排#

while True:
    try:
        s0 = input()
        #非字母元素一律替换为空格，并按空格切片
        for i in range(len(s0)):
            if not s0[i].isalpha():
                s0=s0.replace(s0[i], ' ')
        s1 = s0.split(' ')
        #倒序，将非空元素加入新列表
        s1.reverse()
        s2 = []
        for i in s1:
            if i != '':
                s2.append(i)
        #列表转字符串
        s3 = ' '.join(s2)
        print(s3)
    except:
        break