let h = ref 0

let parent i = int_of_float (floor (float_of_int i) /. 2.)

let left i = 2*i

let right i = 2*i + 1

let extract (t : int array) =
  let rec max_heapify i =
    let l = left i in
    let r = right i in
    let m = if l <= !h && t.(l) > t.(i) then l else i in
    let m = if r <= !h && t.(r) > t.(m) then r else m in
    if m <> i then begin
      let tmp = t.(i) in t.(i) <- t.(m); t.(m) <- tmp;
      max_heapify m
    end
  in
  let ret = t.(1) in
  t.(1) <- t.(!h);
  decr h;
  max_heapify 1;
  ret

let insert x (t : int array) =
  incr h;
  t.(!h) <- x;
  let rec doit i =
    if i > 1 && t.(parent i) < t.(i) then begin
      let tmp = t.(i) in
      t.(i) <- t.(parent i);
      t.(parent i) <- tmp;
      doit (parent i)
    end
  in
  doit !h

let () =
  let t = Array.make 2000001 0 in
  let rec doit () =
    let op = Scanf.scanf "%s " (fun i -> i) in
    if op = "extract" then (Printf.printf "%d\n" (extract t); doit ())
    else if op = "end" then ()
    else (insert (Scanf.scanf "%d " (fun i -> i)) t; doit ())
  in
  doit ()