What do they mean by classify all groups of a certain order

[Bachelier]

what does it mean.

I'm thinking list all groups of such order

for instance. 115 = 5* 23

hence Z5⊕ Z23 ≈ Z115 ???

[Bachelier]

never mind I got it. 5 doesn't divide 22, hence for all grps they are iso to Z115