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: ['N', 'e', '4283', '3243', '5581', '1407', 'q', 'y', '6685', 'v', 'c', '5995']
Example Output: 27194

Example Input: ['2215', '4369', 'e', '4979', '4069', 'J', 'L', '789', 'w', 'p', '9533', '8523', '2531']
Example Output: 37008

Example Input: ['363', 'm', 'f', '6147', '9787', 'L', '7435', '2531', '4163', 'Q', '4215', 'p']
Example Output:
34641