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: ['9509', 'o', 'l', '9873', 'h', 'N', '2059', '8595', 'D', 'L', '5913', 'o', '1443', 'C', 'y', 'K', 'J', 'a', 'X', 'E']
Example Output: 37392

Example Input: ['57', '9977', '2657', 'p', '9573', '7745', '4755', 'U']
Example Output: 34764

Example Input: ['3475', 'W', 'Z', 'M', 'D', '9463', 'R', '9993', 'n', '491', 'e', '8059', '4849', '7089', 'Y', 'q', '7219']
Example Output:
50638