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: ['1073', 'i', 'o', 'j', 'O', 'g', 'X', '3261', '5105', '4831', 'J']
Example Output: 14270

Example Input: ['3497', '761', '6157', 'J', 'n', '139', '9895', '2939', 'K', 'I', '2161', 'c', 'a', '485', '7959', 'i', '4753', '3305', 'G', '3475']
Example Output: 45526

Example Input: ['g', 'y', '6327', 'F', '8205', '8169', '4087', 'r', '6137', 'O', 'o', '4709', '9713', 'r']
Example Output:
47347