If formula support

Hello

I am a school teacher and I have a list of the children's birthday in Column A

In column B I want to record their term of birth -

If Column A contains either September, October, November, December I want column B to return - Aut

If Column A contains either January, February, March, April I want column B to return - Spr

If Column A contains either May, June, July, August I want column B to return - Sum

I am not sure if I need to use a match index formula or an if formula

I was hoping someone could help. The system I get the d.o.b. from is in the format that I have included in cell A.

I have attached a sample excel page of what Column A looks like.

Mark