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

Example Input: ['1207', '1327', 'z', 'j', '6225', '8345', 'R', 'v', '7817', 'F', '289', '281', '9207', '8963']
Example Output:
43661