open System

let getCount key s =
    match Seq.tryFind (fun (k, _) -> k = key) s with
    | Some(_, values) -> Seq.length values
    | None -> 0

let _ = Console.ReadLine()
let left = Console.ReadLine() |> (fun s -> s.Split(" "))
let _ = Console.ReadLine()
let right = Console.ReadLine() |> (fun s -> s.Split(" "))

let groupLeft = left |> Seq.groupBy id
let groupRight = right |> Seq.groupBy id

Seq.append left right
|> Seq.distinct
|> Seq.filter (fun key ->
    (getCount key groupLeft) <> getCount key groupRight)
|> List.ofSeq
|> Seq.sort
|> String.concat " "
|> Console.WriteLine