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: ['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']
Example Output: 19001

Example Input: ['c', 'd']
Example Output: 0

Example Input: ['h', 'x', '7387', '8925', 'a', '9163', '8101', '6803', 'i', '4141', '6127', 'S', '5455', '3887', 'Y']
Example Output:
59989