from __future__ import print_function
import sys, itertools as it

n = int(sys.stdin.readline())

def mul(a, b):
  x,y = a; z,w = b
  return x*z + y*w
def add(a, b):
  x,y = a; z,w = b
  return (x+z, y+w)
def sub(a, b):
  x,y = a; z,w = b
  return (x-z, y-w)

def on_line(a, b, c):
  d = sub(c,a)
  e = sub(c,b)
  return d[0]*e[1] == d[1]*e[0]

if n >= 5:
  line1 = line2 = None
  P = [ map(int, line.split()) for line in sys.stdin ]
  for com in it.combinations(P[:5], 3):
    a,b,c = com
    if on_line(*com):
      line1 = [a,b]; break
  else:
    print("failure")
    sys.exit(0)
  Q = []
  for p in P:
    if not on_line(p, *line1):
      if len(Q) < 2: Q.append(p)
      if len(Q) > 1:
        if line2 is None:
          line2 = Q[:]
        elif not on_line(p, *line2):
          print("failure")
          sys.exit(0)

print("success")