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: ['q', 't', '4837', 'F', '2367', '1867', '8361', 'm']
Example Output: 17432

Example Input: ['h', 'a', '1645', '2391', '759', '519', '3331', '2831', '3427', '9893', 'u', 'J', '7391', '8379', 'V']
Example Output: 40566

Example Input: ['7561', 'D', 'j', '179', 'z', 'w', 'o', 'V', '4409']
Example Output:
12149