fun readStr () =
    let
        fun scan reader stream = SOME (StringCvt.splitl (not o Char.isSpace) reader (StringCvt.skipWS reader stream))
    in
        valOf (TextIO.scanStream scan TextIO.stdIn)
    end


val () =
    let
        val s1 = readStr ()
        val s2 = readStr ()
        val s3 = readStr ()

        val ans = String.implode
                      (
                        List.map (fn s =>
                                     Char.toUpper (String.sub (s, 0)))
                                 [s1, s2, s3]
                      )
    in
          print (ans ^ "\n")
    end