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 main()
{
	int i,j,n;
	const int N=10001;
	bool p[N];
	for(i=2;i<N;++i)p[i]=true;
	for(i=2;i<=N/2;++i)if(p[i])for(j=2*i;j<N;j+=i)p[j]=false;
	while(scanf("%d",&n),n){for(i=n;;--i)if(p[i]&&p[i-2])break;printf("%d %d\n",i-2,i);}
	return 0;
}