class tree:
    height = 10
    age = 30

    def grow(self):
        self.height += 1
        print "I'm growing!!!"

    def flower(self):
        print "I'm in bloom!"

    def __str__(self):
        self.age = self.age + 1
        tree = " | | \n"
        for i in range(self.height):
            tree += " | |\n"
        return tree

    def __init__(self, age, height):
        self.height = height
        self.age = age