N = int(input())
ax, ay = map(int, input().split())
bx, by = map(int, input().split())
cx, cy = map(int, input().split())

if bx <= ax < cx:
  print(N)
  for i in range(1, N + 1):
    print(ax + 1, i)
elif cx < ax <= bx:
  print(N)
  for i in range(1, N + 1):
  	print(ai - 1, i)
elif by <= ay < cy:
  print(N)
  for i in range(1, N + 1):
    print(i, ay + 1)
elif cy < ay <= by:
  print(N)
  for i in range(1, N + 1):
    print(i, ay - 1)
else:
  minx = min(ax, bx)
  miny = min(ay, by)
  maxx = max(ax, bx)
  maxy = max(ay, by)
  print((maxy - miny + 3 + maxx - minx + 3) * 2)
  for i in range(minx - 1, maxx + 2):
    print(i, miny - 1)
    print(i, maxy + 1)
  for i in range(miny - 1, maxy + 2):
    print(minx - 1, i)
    print(maxx + 1, y)