Is 0 considered positive, or is it considered negative?
In you code it is considered negative.

What is the input type? I have tried [Int], but then it says:

    • Couldn't match type ‘Integer’ with ‘Int’
      Expected type: [Int]
        Actual type: [Integer]

and if I try [Integer] I get:

    • Couldn't match type ‘Int’ with ‘Integer’
      Expected type: [Integer]
        Actual type: [Int]

Edit: I figured it out... it's Integral a => [a] and the output is String.
This was not a fun one.