题解 | #单词倒排#

s = input()
w, lst = '', []
for i, c in enumerate(s):
    if 65 <= ord(c) <= 90 or 97 <= ord(c) <= 122:
        w += c
        if i == len(s)-1:
            lst.append(w)
    else:
        if w:
            lst.append(w)
            w = ''
for w in reversed(lst):
    print(w, end=' ')