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', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']
Example Output: 28173

Example Input: ['a', 'q', '4085', '6327', '6869', 'Z', 't', '7057', '1965', 'p', 'o']
Example Output: 26303

Example Input: ['K', 'V', 'm', '9487', 'o', 'm', '399', 'i']
Example Output:
9886