open System

[<EntryPoint>]
let main argv =
    let n = Console.ReadLine() |> int
    let st = Console.ReadLine().Split(' ')
    let s, t = st.[0], st.[1]
    let rec ans i (str : String) =
        if i = n then
            str
        else
            ans (i + 1) (sprintf "%s%c%c" str s.[i] t.[i])
    printfn "%s" (ans 0 "")
    0
