a simple string manipulation

[Luca Ferrari]

Hi to everyone,
I've got a simple problem (I think) that is related to a string manipulation.
I must write often strings like this:
MOVE    A       TO      B

and after it's opposite
MOVE    B       TO      A

Now I'd like to know if there's a way to set a key function so that after I've 
got a group of strings I can simply copy and paste and revert they.
Can you shown me how?
Thanks

-- 
Luca Ferrari,
fluca1978@libero.it