In this task, you are given an input list A. You need to find all the elements of the list that are numbers and calculate their sum.

Q: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

A: 67939
****
Q: ['5233', 'i', 'Z', 'v', '4531', 'j', '61', '1725', '5915', '1677', 'F', 'K', 'M', 'Z']

A: 19142
****
Q: ['8023', 's', 'H', '8573', '7167', 'a']

A:
23763
****