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: ['R', '3361', 'c', 'S', 'g', '3829', '7347', '6633', 'e', '9227']
Example Output: 30397

Example Input: ['v', '4119', 'I', '475', 'd', 'L', '909', 'F', 'V', '775', 'k', 'A', '9411', '8383', 'W', '1521', 'z', 'j', '7057', 'I']
Example Output: 32650

Example Input: ['7829', 'Y', 'W', 'M', 't', '3571', 'W', 'M', '8793', '3359', 'C', 'i', '9589', '447', '4449', '1733', 'o', 'h', 'e', '1647']
Example Output:
41417