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: ['5573', '6221', 'C', '8649', '6603', 'q', '9403']

A: 36449
****
Q: ['3705', '9217', 'C', '4609']

A: 17531
****
Q: ['L', 'K', '411', 'n', 'F', '4525', 'p', 'h', '6519', 'X', '8373', 'e', 'Y', 'o', 'R', '4949', '665']

A:
25442
****