Reverse search of GameObject.FindGameObjectsWithTag

Hi guys
I 've some objects with three (or more) group of tag: es. “A”,“B”,“C”.
I would like to search all gameobject without tag (“A”).

I 've found only GameObject.FindGameObjectsWithTag but there is the inverse o some work around?

Thank you

I think dont exists a “inverse way”.
You can search all the GameObjects with TAG(“A”,“B”,“C”) and with a foreach do stuff for select the needed TAG.