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: ['8207', '4791', '3925', 'b', 'Z', '8471', '9215', '3117', 'p', '9095', 'h', 'k', 'E', 'h', '6047']
Example Output: 52868

Example Input: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']
Example Output: 26299

Example Input: ['Y', '4669', 'x', 'V', '5137', '6193', 'w', '2371', '6691', '5561', '8767', '1223', 'r', 'E', 'b', '5089', '5687', 'M', 'o', 'X']
Example Output:
51388