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


fun findAns s =
    let
        fun findAnsAux nil = nil
          | findAnsAux (#"t" :: #"r" :: #"e" :: #"e" :: #"o" :: #"n" :: #"e" :: tl) =
            (#"f" :: #"o" :: #"r" :: #"e" :: #"s" :: #"t" :: (findAnsAux tl))
          | findAnsAux (h :: tl) =
            (h :: (findAnsAux tl))
    in
        String.implode (findAnsAux (String.explode s))
    end
    


val () =
    let
        val s = readStr ()

        val ans = findAns s
    in
        print (ans ^ "\n")  
    end