/*
TASK: mate
LANG: C++
*/

#include <stdio.h>
#include <stdlib.h>

int main() {
	printf("5\n2-4 5-1 3-2 4-5\n1-3 4-2 3-5\n3-1 1-5 2-3 5-4\n1-2 2-5 3-4 5-3 4-1\n5-2 4-3 1-4 2-1\n");
	return 0;
}
