# your code goes here
def extend(val, list_=[]):
list_.append(val)
return list_
x1 = extend(10)
x2 = extend(123, [])
x3 = extend('a')
print "x1 = %s" % x1
print "x2 = %s" % x2
print "x3 = %s" % x3
IyB5b3VyIGNvZGUgZ29lcyBoZXJlCgpkZWYgZXh0ZW5kKHZhbCwgbGlzdF89W10pOgoJbGlzdF8uYXBwZW5kKHZhbCkKCXJldHVybiBsaXN0XwoKeDEgPSBleHRlbmQoMTApCngyID0gZXh0ZW5kKDEyMywgW10pCngzID0gZXh0ZW5kKCdhJykKCnByaW50ICJ4MSA9ICVzIiAlIHgxCnByaW50ICJ4MiA9ICVzIiAlIHgyCnByaW50ICJ4MyA9ICVzIiAlIHgz