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

Example Input: ['5183', '5251', 'r', '9993', 'F', '1915', 'o', 'J', '5089', 'G', '5763']
Example Output:
33194