how to add word to the front of every word in all rows automatica.

[Jasmine]

I had 1000+ words in all the rows and now I would like to add a symbol "\" to
the front of every words of all rows. Example: The initial word I had is
"people" and now I would like to make it to "\people". All the rows contain
of different words and I just want to add a slash in front of evey words. I
would like to know how to make it.