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: ['J', 'm', '1255', 'S']
Example Output: 1255

Example Input: ['z', 'c', 'E', 'Q', '1839', 'g', 'X', 'c', '291', 'c', 'w', 'e', '5957', 'X', '6471', 'A', '8359', 'y', '3611', '5417']
Example Output: 31945

Example Input: ['8089', '3625', '3237', 'M']
Example Output:
14951