def primeChecker(x):
	factorCount = 0
	y = int(x)
	for i in range (2,y):
		if (x % i) == 0:
			factorCount = factorCount + 1
	if factorCount == 0:
		return 1
	else:
		return 0

intCheck = False
primeCheck = 0
while intCheck == False:
  print("even number")
  number = input()
  try:
    number = int(number)
    intCheck = True
  except:
    print("only enter numbers")

  try:
    evenCheck = number % 2
    if evenCheck != 0:
      print("number must be even")
      intCheck = False
  except:
    intCheck = False

prime1 = number / 2
prime2 = number / 2

while primeCheck != 2:
  primeCheck = 0
  primeCheck = primeCheck + primeChecker(prime1)
  primeCheck = primeCheck + primeChecker(prime2)
  if primeCheck != 2:
    prime1 = prime1 + 1
    prime2 = prime2 - 1

print("the 2 primes which add to ",number," are ",prime1," & ",prime2)