题解 | 单词倒排

s = input()

class SortInv:
    def __init__(self, s):
        self.s = s

    def __call__(self):
        return self.sortinver()

    def sortinver(self):
        result = ''
        for c in self.s:
            if c.isalpha():
                result += c
            else:
                result += ' '

        return ' '.join(result.split()[::-1])

f = SortInv(s)
print(f())