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: ['r', 'B', '8791', '3165', 'n', 'm']
Example Output: 11956

Example Input: ['i', 'o', '5363', '5937', 'x', '6705', 'w', '5495', 'E', '9823', 'F', '83', '8443', '5223']
Example Output: 47072

Example Input: ['c', 'M', 'K', 'S']
Example Output:
0