defmodule Main do
  def main do
    IO.read(:line)
    |> String.trim()
    |> String.to_integer()
    |> solve
    |> IO.puts()
  end

  def solve(a) do
    m = (a * 60) |> div(100)

    [(m |> div(60)) + 10, m |> rem(60)]
    |> Enum.map(&(&1 |> to_string |> String.pad_leading(2, "0")))
    |> Enum.join(":")
  end
end