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 v,k;
		while(1){
			scanf("%d",&v);
			if(v==0)break;
			for(k=v;k>=0;k--){
				if(isprime(k)==1 && isprime(k-2)==1){
					printf("%d %d\n",k-2,k);
					break;
				}
			}
		}
		return 0;
	}