defmodule Main do
  def main do
    beans_sum = IO.gets("") |> String.trim |> String.split |> Enum.map(&String.to_integer/1) |> Enum.take(2) |> sum(0)
    age_sum   = IO.gets("") |> String.trim |> String.split |> Enum.map(&String.to_integer/1) |> Enum.sum
    IO.puts beans_sum
    IO.puts age_sum
    if beans_sum >= age_sum do
      IO.puts beans_sum-age_sum
    else
      IO.puts -1
    end
  end
  
  def sum([], acc) do
    acc
  end
  
  def sum([head|tail], acc) do
    sum(tail, acc*head)
  end
end