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: ['u', 'W', '1561', '9243', '4923', '9385']
Example Output: 25112

Example Input: ['o', 'L', 'E', 'V', 'D', 's', 'Z', 'm', 'a', '2785', 'I', 'v', 'B', '7909', '1599', 'V', 'N']
Example Output: 12293

Example Input: ['4211', 'Q', 'E', '1749', 'T', 'B', '3693']
Example Output:
9653