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: ['8739', 'K']

A: 8739
****
Q: ['c', '4501', 'O']

A: 4501
****
Q: ['C', '7131', 'D', 'r', 'z', 'R', '8243', '9297', '1653', '3595', 'v', '3043', 'v', '5649', 'U', 'w', '283']

A:
38894
****