import os,re

node_version_h = os.path.join(os.path.dirname(__file__), '..', 'src',
    'node_version.h')

f = open(node_version_h)

for line in f:
  if re.match('#define NODE_MAJOR_VERSION', line):
    major = line.split()[2]
  if re.match('#define NODE_MINOR_VERSION', line):
    minor = line.split()[2]
  if re.match('#define NODE_PATCH_VERSION', line):
    patch = line.split()[2]

if int(minor) % 2 == 0:
  print 'stable'
else:
  print 'unstable'
