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: ['T', '721', '6555', 'g', 'y', 'U', '3053', 'A', '9663']
Example Output: 19992

Example Input: ['1165', '8341', '9685', '6749', '8571', 'p', '9355', '5319', '9587', 'B', '9581', '1719', 'Q', '577', '8883', 'S', '7851', '1069', 'i', 'y']
Example Output: 88452

Example Input: ['Z', '8771', 'M', 'D', '6055']
Example Output:
14826