defmodule Main do
  def main do
    IO.read(:line)
    |> String.trim
    |> String.split(":")
    |> Enum.map(&String.to_integer/1)
    |> solve
    |> IO.puts()
  end

  def solve([a, b]) do
    m = a * 60 + b + 5
    n = m |> div(60)

    [
      cond do
        n == 24 -> 0
        true -> n
      end,
      m |> rem(60)
    ]
    |> Enum.map(fn x ->
      x |> to_string |> (&String.pad_leading(&1, 2, "0")).()
    end)
    |> Enum.join(":")
  end
end