#include <stdio.h>

main() {

  const int CNUM = 6;
  char codes[] = {'0', '3', '6', '9', 'C', 'F'};
  for (int r=0; r < CNUM; r++) {
	for (int g=0; g < CNUM; g++) {
	  for (int b=0; b < CNUM; b++) {
		printf("%c%c%c%c%c%c\n", codes[r], codes[r], codes[g], codes[g], codes[b], codes[b]);
//		printf("%1$c%1$c%2$c%2$c%3$c%3$c\n", codes[r], codes[g], codes[b]);
	  }
	}
  }
}