题解 | #单词倒排#

傻瓜式循环：不就大小写26个英文字母加一个空格，全列出来。傻瓜式穷举。

    try:
        a=input()
        d=''
        e=''
        for i in range(len(a)):
           if (a[i] in 'ABCDEFGHIJKLMNOPQRSTUVWXY abcdefghijklmnopqrstuvwxyz'):
              d=d+a[i]
           else:
              d=d+' '
        if(d[0]==" " and d[-1]!=" "):
            d=d[1:]
        if(d[0]!=" " and d[-1]==" "):
            d=d[0:-1]
        if(d[0]==" " and d[-1]==" "):
            d=d[1:-1]
        b=d.split()
        c=b[::-1]
        for letter in c:
            e=e+letter+' '
        print(e)
    except:
        break