#include "stdio.h"
//#include "time.h"
//?????§??????????´???°?????????????????????
// 5<= n <= 10000
//p1=?°????????´???°p2=??§???????´???°

int isprime(int n) {
 int i;  
for(i = 2; i < n; i++) {   //??????????§????????????¨??§??¶??°??§??????????´???°??¨??????
        if(n % i == 0)return 0;    //????????????????????§?´???°??§?????????
    }
    return 1;
}


int main(){
    int i,n,p1,q1;
    //    clock_t start, now;//??£?¨?
    while(1){
        scanf("%d",&n);
        //        start = clock(); // ????§???????
        if(n == 0)break;
        for(i = n;3 <= i;i--){
            if (isprime(i) == 1 && isprime(i - 2) == 1) break;
        }
        p1 = i-2;
        q1 = i;
        //        now = clock(); // ????????????
        //        printf("%f\n", (double)(now - start) / CLOCKS_PER_SEC);//??¬???
        printf("%d %d\n",p1,q1);
    }
}