Filter list Elixir

1_filter_list.ex

defmodule Solution do
  [max | tail ] = IO.read(:all) 
  |> String.split 
  |> Enum.map(&String.to_integer/1) #everything is already integer after this
 
  tail
  |> Enum.filter(fn x -> x < max end)
  |> Enum.each(&IO.puts/1)

end

2_leaner_solution.ex

defmodule Solution do
  [max | tail ] = IO.read(:all) 
  |> String.split 
  |> Enum.map(&String.to_integer/1)
 
  tail
  |> Enum.filter(&(&1 < max))
  |> Enum.each(&IO.puts/1)

end

3_solution_from_someoneelse.ex

defmodule Solution do
    #I'm not familiar with this yet [1/2]
    def filter_by_max([max | nums]) do
        Enum.filter(nums, &(&1 < max))
    end

    def main() do
        IO.read(:stdio, :all) 
        |> String.split()
        |> Enum.map(&String.to_integer(&1))
        # the way this function is called [2/2]
        |> filter_by_max()
        |> Enum.each(&(IO.puts(&1)))
    end

end

Solution.main()

https://www.hackerrank.com/challenges/fp-filter-array/problem?isFullScreen=true