# Define a person class with properties name and age, 
# and methods have_birthday and to_s.
class Person

  def initialize(n, a)
    @name = n
    @age = a
  end
	
  def name
    return @name
  end
	
  def age
    return @age
  end
	
  def age=(a)
    @age = a
  end
	
  def have_birthday
    @age += 1
  end
	
  def to_s
    return "Name: #{name} Age: #{age}"
  end
	
end

p = Person.new("Alice", 13)
print "#{p.name} #{p.age}\n"
print p.to_s, "\n"
p.have_birthday
print p.to_s, "\n"
p.age = 21
print p.to_s, "\n"