Revwords()
revwords(<string>[, <idelim>[, <odelim>]])
Reverses the order of the words of <string>. A word is considered to be any sequence of non-blank characters, separated by blanks, so punctuation characters that follow a word are considered part of the word.
<idelim> may be used to specify an input delimiter other than a space.
<odelim> is the output delimiter.