A number and a list kept in the class

The like count and the tag list are class variables. Predict the output without running the code.

Code

class Post:
    likes = 0
    tags = []

    def __init__(self, author):
        self.author = author

    def like(self):
        self.likes += 1

    def add_tag(self, tag):
        self.tags.append(tag)

a = Post("mina")
b = Post("jun")
a.like()
a.like()
a.add_tag("cat")
b.add_tag("dog")
print(a.likes, b.likes, Post.likes)
print(a.tags, b.tags)