题解 | #单词倒排#

while True:
    try:
        a = input()
        b = str()
        z1 = "abcdefghijklmnopqrstuvwxyz"
        z = z1 + z1.upper()
        for i in a:
            if i in z:
                b += i
            else:
                b += " "
        c = b.strip().split()
        print(" ".join(c[::-1]))
    except:
        break