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
primes = [0, 0] + [1]*9999
for i in range(2, 100):
    for j in range(i*i, 10001, i):
        primes[j] = 0

while True:
    n = int(input())
    if n == 0:
        break
    for i in range(2, n+1)[::-1]:
        if primes[i-2] and primes[i]:
            print(i-2, i)
            break