How to loop a MS Word macro applying word by word in a selection?

How to loop a MS Word macro applying word by word in a selection?

I have a simple macro in order to insert a symbol into the front and back
of a word.
Selection.MoveLeft Unit:=wdWord, Count:=1
Selection.TypeText Text:="a"
Selection.MoveLeft Unit:=wdCharacter, Count:=1, Extend:=wdExtend
Selection.Font.Color = -603914241
Selection.Font.Size = 1
Selection.MoveRight Unit:=wdWord, Count:=1
Selection.MoveLeft Unit:=wdWord, Count:=1
Selection.MoveRight Unit:=wdWord, Count:=1
Selection.MoveLeft Unit:=wdCharacter, Count:=1
Selection.TypeText Text:="a"
Selection.MoveLeft Unit:=wdCharacter, Count:=1, Extend:=wdExtend
Selection.Font.Color = -603914241
Selection.Font.Size = 1
Selection.MoveRight Unit:=wdCharacter, Count:=1
Selection.MoveRight Unit:=wdWord, Count:=1
Is there any way to make the macros looping through each word in the
selection of text? Thanks!