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 java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner in = new Scanner(System.in);
		boolean prime[] = new boolean[1000000];
		for(int i=0;i<prime.length;i++)prime[i]=true;
		prime[0]=false;prime[1]=false;
		for(int s=0;s<prime.length;s++){
			if(prime[s])
				for(int i=s+s;i<prime.length;i+=s)prime[i]=false;
		}
		while(in.hasNext()){
			int n = in.nextInt();
			if(n==0)break;
			int result=0;
			for(int i=2;i<=n;i++)if(prime[i]&&prime[i-2])result = i;
			System.out.println(result-2+" "+result);
		}
	}
}