fun readInt () =
    valOf (TextIO.scanStream (Int.scan StringCvt.DEC) TextIO.stdIn)


fun printAns m ls =
    let
        val table = Array.array (m + 1, 0)
    in
        (
          List.app
              (fn l =>
                  if 0 < l andalso l <= m then Array.update (table, l, Array.sub (table, l) + 1)
                  else ignore ()
              )
              ls;
          Array.appi
              (fn (index, count) =>
                  if index = 0 then ignore ()
                  else print (Int.toString index ^ " " ^ Int.toString count ^ "\n"))
              table
        )
    end


val () =
    let
        val n = readInt ()
        val m = readInt ()
        val ls = List.tabulate (n, fn _ => readInt ())
    in
        printAns m ls
    end