Why doesn't this work the way it's supposed to, or the way it's intuitively apparent from the code, that is, showing the prompt first, getting the line next, and printing the result finally?

main = do
        putStr "Please Enter Your Name: "
        name <- getLine
        putStrLn ("Hello " ++ name)

changing putStr with putStrLn rectifies it to the expected behavior, but I wonder why this version misbehaves. FWIW, I use ghc in cygwin.

Ali