#include <stdio.h>
#include <stdbool.h>
#include <math.h>

bool isPrime(int toBeTested){
    int iterationMax = 0, nowCheck = 2;
    bool isPrime = true;
    iterationMax = sqrt(toBeTested);
    do {
        if (toBeTested % nowCheck == 0) {
            isPrime = false;
            break;
        }
        nowCheck++;
    }
    while (nowCheck <= iterationMax);
    return isPrime;
}

int main() {
    int j;
    for (j = 11; j < 198; j+2) {
        if(isPrime(j) && isPrime(j+2)) {
            printf("%d %d\n", j, j+2);
        }
    }
    return 0;
}