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(-1, 2):
    for j in range(-1, 2):
        if i == 0 and j == 0:
            continue
        print(cx + i, cy + j)