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

import static java.util.Arrays.deepToString;

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}
	void tr(Object... os) {
		System.err.println(deepToString(os));
	}

	Scanner sc = new Scanner(System.in);
	public void run() {
		makePrimes();
		for (;sc.hasNext();) {
			int n = sc.nextInt();
			if (n == 0) break;
			for (int i = n; i > 2; i--) {
				if (isPrime[i] && isPrime[i-2]) {
					System.out.println((i-2) + " " + i);
					break;
				}
			}
		}
	}
	static final int MAX_N = 1024 * 1024;
	boolean[] isPrime = new boolean[MAX_N];
	int[] primes;
	void makePrimes(){
		if (primes != null) return;
		for (int i = 0; i < isPrime.length; i++) isPrime[i] = true;
		isPrime[0] = isPrime[1] = false;
		for (int i = 2; i * i < isPrime.length; i++)
			if (isPrime[i])
				for(int j = i * i; j < isPrime.length; j += i)
					isPrime[j] = false;
		int p = 0;
		for (int i = 2; i < isPrime.length; i++) p += isPrime[i] ? 1 : 0;
		primes = new int[p];
		p = 0;
		for (int i = 2; i < isPrime.length; i++) if (isPrime[i]) primes[p++] = i;
	}
}