defmodule Solution do
    def dedupe(input) do
        String.codepoints(input)
        |> Enum.reduce("", fn x, acc ->
            if String.contains?(acc, x) do
                acc
            else  
                acc <> x
            end
        end)
    end
end

input = IO.read(:stdio, :all)

Solution.dedupe(input)
|>IO.puts