I need to enter over 200 serial numbers into Excel.

They all start with the same 6 characters and all end in the same 3 like so:
E33213**0P5

Can I format the cells so that I only have to input the 2 middle characters
and Excel will auto fill the other information?

The 2 characters I need to enter are letters, not numbers.

I tried the following without any luck:
E33213??0P5
E33213##0P5