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: ['9863', 'y']
Example Output: 9863

Example Input: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']
Example Output: 14966

Example Input: ['I', 'c', '5455', '9893', '3397', '4447', 'V', 'J', '7039']
Example Output:
30231