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
r = 10001
sqrt = int(r**0.5)
p = [1]*r
p[0] = 0
for i in range(1,sqrt):
	if p[i]:
		p[2*i+1::i+1] = [0 for x in range(2*i+1,r,i+1)]

while True:
	n = int(raw_input())
	if n == 0: break
	for i in range(n,1,-1):
		if p[i-1] and p[i-3]:
			print i-2,i
			break