#include <stdio.h>

int main(void) {
	int n, i, j;
	scanf("%d", &n);
	puts("1. faze");
	for (i=1, j=n-1; i<j; i++, j--)
		printf(" %d<->%d", i, j);
	puts(" -\n2. faze");
	for (i=1, j=n; i<j; i++, j--)
		printf(" %d<->%d", i, j);
	puts(" -");
	return 0;
}