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: ['3895', 's', 'j', '7755', 'H', '7941', '4903', 's', '3629', '1183', '1001', '5569', 'q', '4735']
Example Output: 40611

Example Input: ['t', '7469', 'Y', 'N', '8137']
Example Output: 15606

Example Input: ['C', '4333', '6789', '7813', '8967', '3155', 'v', 'T', 'j', 'S', '4571', 'B', '3161']
Example Output:
38789