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: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
Example Output: 14215

Example Input: ['8763', 'k', '3653', 'v', 'd', 'D', 'm', '1037', 'c', 'F', '2349', '7843', '3259', 'v', '5555', '7565', '8137', 't']
Example Output: 48161

Example Input: ['T', 'n', '8513', '5565', '6343', '1403', '975', '6959', '8049', '1601', 'j', 'Q', 'O', '7889', 'r', 'D', '1903', '6607']
Example Output:
55807