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: ['6577', 'Q', '6865', '7671', 'N']
Example Output: 21113

Example Input: ['Q', '2271', '1803', '2363']
Example Output: 6437

Example Input: ['6011', 'G', '9043', '8009', 'e', '9493', 'G', '7969', 'M', 'n', 'p', 'g', '7925', 'H', '3213', '8095', '97', 'F']
Example Output:
59855