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: ['4463', '489']
Example Output: 4952

Example Input: ['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
Example Output: 30645

Example Input: ['9861', '9177', 'x', '6991', 'Z', '1715', 'p', '765', '2711', 'i', '1801', 'H', '5803', 'd', 'm']
Example Output:
38824