Error detection in a Python class (Example 2)

Find the logical and syntactical errors in the following Python code snippet.

class A:
    attr = 1
    @classmethod
    def cls_meth(cls, a):
        return cls.attr + a

    @staticmethod
    def stc_meth(a):
        return a * a

    @property
    def prop(self):
        return self.attr

A.cls_meth(1)
A.stc_meth(1)
A.prop


a = A()

a.cls_meth(1)
na.stc_meth(1)
na.prop