class Dog():
 def __init__(self, name, age):
  self.name = name
  self.age = age

 def sit(self):
  print(self.name.title() + "is now sitting.")

 def roll_over(self):
  print(self.name.title() + "rolled over!")


my_dog = Dog('willie', 6)

print("My dog's name is " + my_dog.name.title() + ".")
print("My dog is " + str(my_dog.age) + " years old.")