#!/usr/bin/python
age=20
#if age>=18:
#	print "your age is",age
#	print 'adult'
#if age>=18:
#	print 'your age is',age
#	print 'adult'
#else:
#	print 'your age is',age
#	print 'teenager'
#if age>=18:
#	print 'adult'
#elif age>=6:
#	print 'teenager'
#else:
#	print 'kid'
#age=20
#if age>=18:
#	print 'age>=18'
#elif age>=24:
#	print ("age>=24")
#else:
#	print ('ok')
#if 1:
#if 0:
#	print '111'
#else:
#	print '222'
name=[]
print len(name)
if name:
	print 'not null'
else:
	print 'null'