import System.Environment
 
slideWords :: Int -> String -> String -> (String, String)
slideWords n a b = (drop ((length a) - n) a, take n b)
 
overlaps :: String -> String -> [(String, String)]
overlaps a b = [slideWords n a b | n <- [0..minLength]]
  where minLength = min (length a) (length b)
 
longestOverlap :: String -> String -> String
longestOverlap a b = fst $ last $ (filter (\(a,b) -> a==b) $ overlaps a b)
 
condenseWords :: String -> String -> String
condenseWords a b = if overlap == ""
                    then a ++ " " ++ b
                    else a ++ (drop (length overlap) b)
  where overlap = longestOverlap a b
 
condense :: String -> String
condense ws = foldr condenseWords "" $ words ws
 
main = do
  input <- fmap unwords getArgs
  putStrLn $ condense input
 

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I heard the pastor sing liverses easily.
Deep episodes of Deep Space Nine came on the television only after the news.
Digital alarm clocks scare area children.