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: ['5749', 'l', '3297', '8913', '4625', 'M', 'X', 'g', '3143', 'i', '8369', '6101', 'w', '3683', '3891', '1399', '9105', '6923', 'K']
Example Output: 65198

Example Input: ['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']
Example Output: 56499

Example Input: ['9893', 'y', 'B', '5481', 'c', 'G', '8585', '4149', 'O', '1605', '189', 'I', 'a', 'G']
Example Output:
29902