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: ['G', 'o', 'g', 'I', 'S', '9193', 'G', 'C', '2481', '435', 'm', '1005', '5605', '6501', 'D']
Example Output: 25220

Example Input: ['I', '7815']
Example Output: 7815

Example Input: ['r', 'n', 'Y', '2281', 'v', '9483', 'n', 'y', 'V', '2547', 'p', 'G', '7383', '2709', 'O', '1961', '1521', '1051', '9477', 'X']
Example Output:
38413