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: ['F', 'z', '1159', '345']
Example Output: 1504

Example Input: ['3655', '1349', '6519', '1019', 'v', '4811', '8609', '9147', '8225', '2665', '2627', '5839']
Example Output: 54465

Example Input: ['2511', '6585', 'T', '1203']
Example Output:
10299