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: ['i', 'o', '1321', 'I', 'W', 'e', '1201', 'I', 'e', 'F', '9841', 'm', '9827', 'q', 'f', 'X', '8261']
Example Output: 30451

Example Input: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']
Example Output: 36604

Example Input: ['6355', 'g', 'R']
Example Output:
6355