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: ['R', '9751', '4367', 'l', 'N', '5125', '8751', '7507', 'y', 'K', '6127']

A: 41628
****
Q: ['D', 'R', 'Y', '4929', 'P', '7929']

A: 12858
****
Q: ['2707', '2297', '1299', '1957', 'x', 'r', 'M', 'T', '9575', '3867', 'c', '403', '1755']

A:
23860
****