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
#include <iostream>
#include <math.h>

#define N 10001

using namespace std;

int main(void){
	bool isprime[N];
	for(int i=0;i<N;i++) isprime[i]=true;
	int upto = (int)sqrt(N);
	for(int i=2;i<=upto;i++){
		if(isprime[i]){//消されてなければその倍数を消す
			for(int j=2;i*j<=N;j++) isprime[i*j] = false;
		}
	}
	int n;
	while(cin >> n){
		if(n==0)break;
		int p1,q1,w=3;
		for(int i=n;i>=3;--i){
			if(isprime[i]&&isprime[i-2]){
				q1=i;
				p1=i-2;
				break;
			}
		}
		cout<<p1<<" "<<q1<<"\n";
	}
	return 0;
}