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: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']
Example Output: 26299

Example Input: ['7361', '3605', 'V', '2039', '9665', 'X', 'b', '1195', '657', '6509', '7195', '2013', '1847', 'v', '9499', '1761']
Example Output: 53346

Example Input: ['R', 'e', 'y', 'R', 'i', 'm', '3373', 'E', '8987', 'A', 'h', '2497', 'J', 'Y', '6237', 'C']
Example Output:
21094