list comprehension

Hi,

I have a script here

interleave :: [Integer] -> [Strings] -> [String]
interleave (x:xs) (y:ys)
= words [a | a <- (unwords [(show x), (filter (/= 1) y), "+"])]

and the error message i receive is

(Instance of Num Char required for definition of interleave)

and I don't understand what this is asking of me.

Please help if you are able to!!!

Thanks.....Steph

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