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<bits/stdc++.h>
using namespace std;

int main(){
  int prime[10001]={0};

  prime[0]=prime[1]=1;
  for(int i=2;i<sqrt(10000);i++){
    if(!prime[i]){
      for(int j=0;i*(j+2)<10000;j++){
	prime[i*(j+2)]=1;
      }
    }
  }

  int n;
  while(cin>> n,n){
    for(int i=n;i>1;i--){
      if(!prime[i] && !prime[i-2]){
	printf("%d %d\n",i-2,i);
	break;
      }
    }
  }
}