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: ['r', '2251', 'X', 'H', 'a', '5463', 'g', 'M', '9797', '1581', 'o', 'm', 'v', 'E']
Example Output: 19092

Example Input: ['y', 'R', 'b', 'v', 'm', 'H', '9903', '8689', 'D', '1023', 'a', '233', '1833', 'o', 'n', 'm', '5531']
Example Output: 27212

Example Input: ['2875', 't', '5051', '115', '7889', '4101', 'X', 'O', 'L', '2245', '3307', 'K', '441', '6111', 'V', 'L', 'c', '6659', '7745', 'S']
Example Output:
46539