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: ['3051', 'Z', 'q', 'u', 'x', '2747', 'e', 'B', '4225', 'Q', 'R', '4629', 'F']
Example Output: 14652

Example Input: ['3975', 's', 'g', 'a', 'c', 'd', '183', 'h', '2585', 'g', 'C']
Example Output:
6743