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 sys, math, collections
  from collections import defaultdict
  
  # from itertools import permutations,combinations
  
  
  def file():
      sys.stdin = open("input.py", "r")
      sys.stdout = open("output.py", "w")
  
  
  def get_array():
      l = list(map(int, input().split()))
      return l
  
  
  def get_ints():
      return map(int, input().split())
      # return a,b
  
  
  def get_3_ints():
      a, b, c = map(int, input().split())
      return a, b, c
  
  
  def sod(n):
      n, c = str(n), 0
      for i in n:
          c += int(i)
      return c
  
  
  def isPrime(n):
      if n <= 1:
          return False
      if n <= 3:
          return True
      if n % 2 == 0 or n % 3 == 0:
          return False
      i = 5
      while i * i <= n:
          if n % i == 0 or n % (i + 2) == 0:
              return False
          i = i + 6
  
      return True
  
  
  def getFloor(A, x):
  
      (left, right) = (0, len(A) - 1)
  
      floor = -1
      while left <= right:
          mid = (left + right) // 2
          if A[mid] == x:
              return A[mid]
          elif x < A[mid]:
              right = mid - 1
          else:
              floor = A[mid]
              left = mid + 1
  
      return floor
  
  
  def chk(aa, bb):
      f = 0
      for i in aa:
          for j in bb:
              if j[0] >= i[0] and j[1] <= i[1]:
                  f += 1
              elif j[0] <= i[0] and j[1] >= i[1]:
                  f += 1
              elif i[0] == j[1] or i[1] == j[0]:
                  f += 1
              else:
                  continue
      return f
  
  
  # file()
  def main():
      s = input()
      print(s[:4] + " " + s[4:])
  
  
  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"}]