How to get all names of a classes' classmethods in Python

I want to find out all classmethods of class Something below by using code reflection. With all classmethods i mean all methods which are decorated with @classmethod. I don't actually know if that is the same.

class Something:
    @classmethod
    def a(cls):
        print('a')

    @staticmethod
    def b(cls):
        print('b')

    def c(self):
        print('c')

So in this case I expect getting a list which contains only 'a':

get_classmethod_names(Something) == ['a']