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: ['2215', '4369', 'e', '4979', '4069', 'J', 'L', '789', 'w', 'p', '9533', '8523', '2531']
Example Output: 37008

Example Input: ['l', 'V']
Example Output: 0

Example Input: ['9413', 'B', '4183', 'I', 'o', 'D']
Example Output:
13596