N = int(input())
ax, ay = map(int, input().split())
bx, by = map(int, input().split())
cx, cy = map(int, input().split())
print(8)
for i in range(cx - 1, cx + 2):
	for j in range(cy - 1, cy + 2):
		if not (i == cx and j == cy):
			print(i, j)