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: #!/usr/bin/env python3
  from collections import defaultdict, deque
  from heapq import heappush, heappop
  from bisect import bisect_left, bisect_right
  import sys, random, itertools, math
  
  sys.setrecursionlimit(10**5)
  input = sys.stdin.readline
  sqrt = math.sqrt
  
  
  def LI():
      return list(map(int, input().split()))
  
  
  def LF():
      return list(map(float, input().split()))
  
  
  def LI_():
      return list(map(lambda x: int(x) - 1, input().split()))
  
  
  def II():
      return int(input())
  
  
  def IF():
      return float(input())
  
  
  def S():
      return input().rstrip()
  
  
  def LS():
      return S().split()
  
  
  def IR(n):
      return [II() for _ in range(n)]
  
  
  def LIR(n):
      return [LI() for _ in range(n)]
  
  
  def FR(n):
      return [IF() for _ in range(n)]
  
  
  def LFR(n):
      return [LI() for _ in range(n)]
  
  
  def LIR_(n):
      return [LI_() for _ in range(n)]
  
  
  def SR(n):
      return [S() for _ in range(n)]
  
  
  def LSR(n):
      return [LS() for _ in range(n)]
  
  
  mod = 1000000007
  inf = 1e10
  
  
  # solve
  def solve():
      s = S()
      print(s[:4], s[4:])
      return
  
  
  # main
  if __name__ == "__main__":
      solve()
  
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"}]