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493 B

import Data.List as L
formatLine :: [String] -> [String]
formatLine x = map (\e -> e ++ [' ' | _ <- [length e..nb]]) x
where nb = maximum $ map length x
completeMatrix :: [[String]] -> [[String]]
completeMatrix m = map (\e -> e ++ [""| _ <- [length e..nb]]) m
where nb = maximum $ map length m
main = do
content <- getContents
putStr $ unlines $ map unwords $ L.transpose $ map formatLine $ L.transpose $ completeMatrix $ map words $ lines content