output_description: Print the string putting a single space between the first 4 letters and last 8
  letters in the string s. Put a line break at the end.
  
  * * *
input_description: The input is given from Standard Input in the following format:
  
      
      
      s
attempt: # -*- coding: utf-8 -*-
  # !/usr/bin/env python
  # vim: set fileencoding=utf-8 :
  
  """
  #
  # Author:   Noname
  # URL:      https://github.com/pettan0818
  # License:  MIT License
  # Created:  2016-09-28
  #
  
  # Usage
  #
  """
  from __future__ import division
  from __future__ import unicode_literals
  from __future__ import print_function
  from __future__ import absolute_import
  
  
  def input_process():
      """Receive Inputs."""
      return input()
  
  
  def insert_space(target_str: str) -> str:
      """
      >>> insert_space("codefestival")
      code festival
      """
      return target_str[0:3] + " " + target_str[3:]
  
  
  if __name__ == "__main__":
      target = input()
  
      print(insert_space(target))
  
problem_description: Statement
  
  This contest is `CODE FESTIVAL`. However, Mr. Takahashi always writes it
  `CODEFESTIVAL`, omitting the single space between `CODE` and `FESTIVAL`.
  
  So he has decided to make a program that puts the single space he omitted.
  
  You are given a string s with 12 letters. Output the string putting a single
  space between the first 4 letters and last 8 letters in the string s.
samples: [{"input": "CODEFESTIVAL", "output": "CODE FESTIVAL\n    \n\nPutting a single space between the first 4 letters and last 8 letters in\n`CODEFESTIVAL` makes it `CODE FESTIVAL`.\n\n* * *"}, {"input": "POSTGRADUATE", "output": "POST GRADUATE\n    \n\n* * *"}, {"input": "ABCDEFGHIJKL", "output": "ABCD EFGHIJKL"}]