How do I select lists inside a list that have a specific length in Haskell?

In Haskell I have a list that looks like this:

[[["PersonA"],["AddressA"]],[["PersonB"],["AddressB"]],[["PersonC"]]]

and I need the lists within my list that have length=2, i.e. the people that I know the address of. In this case, I would want:

[["PersonA"],["Address"]]

and

[["PersonB"],["Address"]]

and I would not want PersonC because I don't have his address.

I was thinking about something like:

myList = [[["PersonA"],["123456789"]],[["PersonC"],["987654321"]],[["PersonE"]]]

main :: IO ()
main = do
  map (\x -> if length x == 2 print x else print "") myList

(print is just an example, I will need to work with them later)

But this returns a

Couldn't match expected type ‘IO ()’ with actual type ‘[IO ()]’

error on line 5.

Any idea how to do that?

Thanks