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: ['o', '445', '2601', 'h', 'V', 'C', 't', 'o', 'H', '3707', '7601']
Example Output: 14354

Example Input: ['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']
Example Output: 26596

Example Input: ['8545', 'k', 'b', 'Z', '503', 'h', 'l', '3195', '1837']
Example Output:
14080