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: ['v', 't', 'a', 'r', 'O', 'I']

A: 0
****
Q: ['6921', 'a', 'U', '2821', '2111', 'h', '3937', '3697', 'd', '6309', 'q', '7961', '5287', '5375', '2721', '4523', 'V', '8633', 'c', '7643']

A: 67939
****
Q: ['r', '2605', 'M', '6447', '7799', 'M', 'T', '8097', '8457', '9031', '5383', 'P', '3117', 'y', 'W', '3199', '8671', 'o']

A:
62806
****