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>

using namespace std;

bool prime(int n){
	for(int i=2;i*i<=n;i++){
		if(n%i==0)return false;
	}
	return true;
}

int main(){
	int n;
	while(cin>>n,n!=0){
		while(true){
			if(prime(n)&&prime(n-2)){
				cout<<n-2<<" "<<n<<endl;
				break;
			}
			n--;
		}
	}
	return 0;
}