Help for make this command

[SutinG]

Hi!

I'm making a command for that the allies players can exchange the owner of his units.

For example:


TRIGGER 1:

Accept
    Events
        Player - Player "x" types a chat message containing -change as A substring
    Conditions
    Actions

Triger2:

Accept
    Events
        Player - Player "x" types a chat message containing -accept as An exact match
    Conditions
    Actions
        Unit Group - Pick every unit in (Units owned by (Triggering player)) and do (Actions)
            Loop - Actions
                Unit - Change ownership of (Picked unit) to Player "x"... ETC

If the player 1 types -change 3, the player 3 will have to type -accept to change the owner of units.

I need help for do it

Thanks in Advance!