题解 | #单词倒排#

import sys

for line in sys.stdin:
    tmp= line.rstrip()
    tmp2=""
    for i in tmp:
        if i.isalpha():
            tmp2+=i
        else:
            tmp2+=" "
    a = reversed(tmp2.split())
    n = ""
    for i in a:
        for x in i:
            if x.isalpha():
                n+=x
            else:
                if n[-1] != " ":
                    n+=" "
        if n[-1] != " ":
            n+=" "        
    print(n)

tmp2=""
for i in tmp:
    if i.isalpha():
        tmp2+=i
    else:
        tmp2+=" "
#后面这段代码是因为不加它之前，包含非字母的词没有被倒转，下次再来优化。