题解 | 单词倒排

l = []
for i in range(128):
    if i not in range(65,65+27) and i not in range(97,97+27):
        l.append(chr(i))
a = input()
l2 = []
for i in a:
    if i in l:
        l2.append(" ")
    else:
        l2.append(i)
temp = "".join(l2).split()
print(" ".join(temp[::-1]))