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: ['1395', '3605', '6001', 's', 'h', 'T', 'K', 'X', '9413', 'X', '5099', 'c', 'f', 't', 'S', 'f', '4651']
Example Output: 30164

Example Input: ['F', 'v', 'G', '6023', 'M', 'Q', 'A', '8477', '2079', 'A', '813', 'C', '3479', 'G', '1977', '5569', '8749', 'Y']
Example Output: 37166

Example Input: ['x', '5565', '7493', '8309', '6781', '4929', 'x', 'k', '4579', 'T', 'n', 'T', '8397', '647', '4475']
Example Output:
51175