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;
int n;
bool isP(int x){
  if(x==0||x==1)return false;
  for(int i=2;i*i<=x;i++){
    if(x%i==0)return false;
  }
  return true;
}
int main(){
  while(cin>>n&&n){
    for(int i=n;i-2>=1;i--){
      if(isP(i)&&isP(i-2)){
	cout<<i-2<<' '<<i<<endl;
	break;
      }
    }
  }
}
