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: import math
  import queue
  import bisect
  import heapq
  import time
  import itertools
  
  mod = int(1e9 + 7)
  
  
  def swap(a, b):
      return (b, a)
  
  
  def my_round(a, dig=0):
      p = 10**dig
      return (a * p * 2 + 1) // 2 / p
  
  
  def gcd(a, b):  # 最大公約数
      if a < b:
          a, b = swap(a, b)
      if b == 0:
          return a
      else:
          return gcd(b, a % b)
  
  
  def lcm(a, b):  # 最小公倍数
      return a / gcd(a, b) * b
  
  
  def divisors(a):  # 約数列挙
      divisors = []
      for i in range(1, int(a**0.5) + 1):
          if a % i == 0:
              divisors.append(i)
              if i != a // i:
                  divisors.append(a // i)
      return divisors
  
  
  def is_prime(a):  # 素数判定
      if a < 2:
          return False
      elif a == 2:
          return True
      elif a % 2 == 0:
          return False
      sqrt_num = int(a**0.5)
      for i in range(3, sqrt_num + 1, 2):
          if a % i == 0:
              return False
      return True
  
  
  def prime_num(a):  # 素数列挙
      pn = [2]
      for i in range(3, int(a**0.5), 2):
          prime = True
          for j in pn:
              if i % j == 0:
                  prime = False
                  break
          if prime:
              pn.append(i)
      return pn
  
  
  def prime_fact(a):  # 素因数分解
      sqrt = math.sqrt(a)
      res = []
      i = 2
      if is_prime(a):
          res.append(a)
      else:
          while a != 1:
              while a % i == 0:
                  res.append(i)
                  a //= i
              i += 1
      return res
  
  
  def main():
      s = input()
      ans = []
      ans.append(s[0:4])
      ans.append(" ")
      ans.append(s[4:12])
      print("".join(ans))
      return
  
  
  if __name__ == "__main__":
      main()
  
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"}]