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', '1337', 'C', 'T', '863', 'j', '2369', 'P', 'A', 'x', '5725', '2333', 'Q', '9149', 'Q', '8529', 'N']
Example Output: 30305

Example Input: ['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']
Example Output: 35729

Example Input: ['D', '4871', '701', 'V', '7269', '6679', 'w', 'B', '885', '2049', '3177', 'z', '4213', '6473', 'x', 'J', 'e']
Example Output:
36317