Prime numbers are widely applied for cryptographic and communication technology. A twin prime is a prime number that differs from another prime number by 2. For example, (5, 7) and (11, 13) are twin prime pairs.

In this problem, we call the greater number of a twin prime "size of the twin prime."

Your task is to create a program which reads an integer n and prints a twin prime which has the maximum size among twin primes less than or equals to n

You may assume that 5 ≤ n ≤ 10000.



Input

The input is a sequence of datasets. The end of the input is indicated by a line containing one zero. Each dataset is formatted as follows:


n (integer)


Output

For each dataset, print the twin prime p and q (p < q). p and q should be separated by a single space.

Example

Input

12
100
200
300
0


Output

5 7
71 73
197 199
281 283
# AOJ 0150 Twin Prime
# Python3 2018.6.17 bal4u

MAX = 10001
SQRT = 100     # sqrt(MAX)

prime = [True]*MAX
def sieve():
#	for i in range(4, MAX, 2):
#		prime[i] = False
	for i in range(3, SQRT, 2):
		if prime[i] is True:
			for j in range(i*i, MAX, i):
				prime[j] = False
sieve()
tbl, ans = [0]*MAX, 0
for i in range(5, MAX, 2):
	if prime[i] and prime[i-2]: ans = i
	tbl[i] = ans
	
while True:
	n = int(input())
	if n == 0: break
	if (n & 1) == 0: n -= 1
	print(tbl[n]-2, tbl[n])
