object Main extends App {
    val line = List("a","ab","abc","xyz","mnp","ac","d","b","ab","bc","bd","be","bf","b","abc","abc","pqr","mnp","jkl","a","b")
 
    val lengthAndTheWords = line.map(x => (x.length,x)).groupBy(x => x._1).mapValues(x => x.toSet)
    val longest = lengthAndTheWords.toSeq.sortBy(key => -key._1).head
 
    println("Max length =" + 
            longest._1 +
            ", words are" + 
            longest._2.map(nextEntry => nextEntry._2).mkString(","))
}

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