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.

Example Input: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']
Example Output: 35729

Example Input: ['v', '9511', 'f', 'q']
Example Output: 9511

Example Input: ['1037', 'h', 'V', '1871', '673', '6619', 'O', 'N', 'Y', 'V', '4913', '3775', '471', 'k', 'p', 'C', 'Z', '4303']
Example Output:
23662