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: ['6629', 'o', 'e', '497', '4865', '8733', '5733', '7337', 'N']

A: 33794
****
Q: ['2325', '3259', '1947', '8065', 'H', '2329', 'h', 'l', 'k', 'R']

A: 17925
****
Q: ['U', 'x', '3243', '7325', '7249', 'f']

A:
17817
****