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: ['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

A: 39896
****
Q: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

A: 17925
****
Q: ['w', '2887']

A:
2887
****