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 <stdio.h>
int isprime(int n){
  for(int i = 2 ; i*i<=n ;i++){
    if(n%i==0)return 0;
}
 return 1;
}
int main(){
  int number[10000+2]={0};
  int n ,i , fir ,sec;
  while(scanf("%d" ,&n)){
    if(n==0)break;
    fir = 0 ,sec = 0;
    for(i=n ;i>3 ;i--){
      if(isprime(i) && isprime(i-2)){
        fir = i-2;
        sec = i;
        break;
      }
    }
    printf("%d %d\n" ,fir ,sec);
  }
  return 0;
}