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: ['u', 'i', 'z', 't', '9617', 'd', '3255', 'w', 'S', '3041', '7451']
Example Output: 23364

Example Input: ['W', 'c', '7971', 'J', 'o']
Example Output: 7971

Example Input: ['9391', '7417', 'h', '8195', '2331', 'G', 'n']
Example Output:
27334