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<cstdio>

using namespace std;

int is_prime(int n){
	int i;
	if(n<=1) return 0;
	if(n==2) return 1;
	if(n%2==0) return 0;

	for(i=3;i * i<=n;i+=2)
		if(n%i==0)
			return 0;
	return 1;
}

int main(void){
	int i;
	int n;

	for(;;){
		scanf("%d",&n);
		if(!n)
			break;

		for(i=n;i>=2;i--)
			if(is_prime(i)) 
				if(is_prime(i-2)){
					printf("%d %d\n",i-2,i);
					break;
				}
	}

	return 0;
}