let c = 1000000007

let ans n m =
  let rec sum i n s =
    if i = n then s
    else
      let x = Scanf.scanf " %d" (fun x -> x) in
      sum (i + 1) n (s + (2 * i - n + 1) * x)
  and f x = abs x mod c in
  f (sum 0 n 0) * f (sum 0 m 0) mod c

let () = Scanf.scanf "%d %d" (fun n m -> print_int (ans n m))
