from random import random as rnd

def add_lametta(func):
    def wrapper(*args, **kwargs):
        return func(*args, **kwargs).replace('+++', '+/+')
    return wrapper

def add_bulbs(func):
    def wrapper(*args, **kwargs):
        return "".join([x if x in ' \n' or rnd() < 0.9 else 'o' for x in func(*args, **kwargs)])
    return wrapper

def add_stars(func):
    def wrapper(*args, **kwargs):
        return "".join([x if x in ' \n' or rnd() < 0.9 else '*' for x in func(*args, **kwargs)])
    return wrapper

@add_lametta
@add_bulbs
def generate_christmas_tree(height):
    return "\n".join(["".join(['+' if abs(j - (height)/2) < i/2 else ' '
                               for j in range(height)]) for i in range(height)])

print("christmas tree:")
print(generate_christmas_tree(14))