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: ['5573', '6221', 'C', '8649', '6603', 'q', '9403']
Example Output: 36449

Example Input: ['7381', 'X', 'm', '6627', 'e', '5277', '6837', '4285', '6197']
Example Output:
36604