i have a general question about string manipulation:

let's say for example that i have an input box. in this input box a user can type in any random string of characters (e.g. ALWOGHKEIRT). How would I code a button so that each time it is clicked a space is inserted between "W"'s and "O"'s for example? so, "ALWOGHKEIRT" becomes
"ALW OGHKEIRT" (or "DPLIJWOLMNSGWOP" becomes "DPLIJW OLMNSGW OP" or any other random string)

thanks