open System
open System.Collections.Generic

module InputUtility =
    let InputTokens = new Queue<string>()

    let EnsureInput () =
        if InputTokens.Count = 0 then
            let input = Console.ReadLine ()
            let s = input.Split ([|' '|], StringSplitOptions.RemoveEmptyEntries)
            if s.Length > 0 then
                for x in s do InputTokens.Enqueue(x)
                true
            else false
        else true

    let rec ReadNext () =
        if EnsureInput () then InputTokens.Dequeue ()
        else ReadNext ()

    let ReadNextInt () = ReadNext () |> int

    let Read2Int () = ReadNextInt (), ReadNextInt ()

    let Read3Int () = ReadNextInt (), ReadNextInt (), ReadNextInt ()

    let ReadListOf f n =
        let rec loop acc = function
            | 0 -> List.rev acc
            | c -> loop ((ReadNext () |> f) :: acc) (c-1)
        loop [] n

    let MultipleCaseWithId f =
        let caseNum = ReadNextInt ()
        let rec loop index =
            if index = caseNum then ()
            else
                f index
                loop (index + 1)
        loop 0

    let MultipleCase f = MultipleCaseWithId (fun _ -> f ())

    let ReadList n =
        let rec loop acc = function
            | 0 -> List.rev acc
            | c -> loop (ReadNext () :: acc) (c-1)
        loop [] n

open InputUtility

module ARC077 =
    let private Mod = 1000000007L

    let private Pushpush () =
        let n = ReadNextInt ()
        let r = Array.zeroCreate n
        let rec loop i j b = function
            | [] ->
                System.String.Join(" ", r |> Seq.map (fun c -> c.ToString()))
                |> printfn "%s"
            | h :: t ->
                r.[if b then i else j] <- h
                let ni, nj = if b then i + 1, j else i, j - 1
                loop ni nj (not b) t
        ReadListOf int n
        |> List.rev
        |> loop 0 (n - 1) true

    let Entry = Pushpush

ARC077.Entry ()