Question

Why i can’t do this?
Its forbidden the use of ‘do’ in this question :/
How i can call words in my list and at same time result an IO?
Thanks.. this is my actual code :/

main :: IO()
main = 
     putStr "Name of File: " >>
     getLine >>=
     \st ->
    openFile st ReadMode >>=
    \handle ->
        hGetContents handle >>=
        \y ->
        words y >>=
        \strings ->
            strings !! 1 >>=
            \string->
                 putStr string

[Edit] Solution :

main :: IO()
main = 
     putStr "Name of File: " >>
     getLine >>=
     \st ->
    openFile st ReadMode >>=
    \handle ->
        hGetContents handle >>=
        \y ->
        return (words y) >>=
        \strings ->
            return (strings !! 1) >>=
            \string->
                 putStr string

Answer 1

Use return (words y) instead of just words y. return wraps a pure value (such as the [String] that words returns) into a monad.

From your wording, it sounds like this question is homework. If so, it should be tagged as such.