Haskell: Convert list of words to a sentence in upper case

Prelude> import Data.Char
Prelude Data.Char> let wordsToSentence list = [toUpper c | word <- list, c <- ' ' : word]
Prelude Data.Char> 
Prelude Data.Char> wordsToSentence ["Hello", "PTR", "How", "are", "you"]
" HELLO PTR HOW ARE YOU"

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