Add and Subtract ( shuffle) new round

980

984

 Minchane:

Someone suggested me roles change

Like  first round , A's subtract , second round, A's add and so on...

Anyone one has suggestions please comment  

Ok. 

990

 Minchane:

Someone suggested me roles change

Like  first round , A's subtract , second round, A's add and so on...

Anyone one has suggestions please comment  

how about shifting some alphabets to add and some to sub?

996