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: ['6815', 'A', '1055', '4687', '8675', '4615', 'a', '2127', 'w', 'l', 'J', '5025', 'c', 't', '9727', 'G', '8431']
Example Output: 51157

Example Input: ['5749', 'l', '3297', '8913', '4625', 'M', 'X', 'g', '3143', 'i', '8369', '6101', 'w', '3683', '3891', '1399', '9105', '6923', 'K']
Example Output: 65198

Example Input: ['1235', 'l', '6749', 'o', 'k', 'B']
Example Output:
7984