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: ['29', 'N', '5061', '7191', 'z', '8367']

A: 20648
****
Q: ['J', '5149', 'H', 'L', 'm', 'h', '3863', 'n', 'z']

A: 9012
****
Q: ['k', '7993', 'j', '1843', 'a', '4283', 'K', '997', 'j', 'j', 'C', '665']

A:
15781
****