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', '5885', 'u', 'Y', 's', 'w', 'j', '9629', '9505', 'U']
Example Output: 25019

Example Input: ['s', 'd', 't', '8235', '2279', '7477', '3029', '4377', '9153', '4309', '2295', '407']
Example Output: 41561

Example Input: ['A', '7681', '2269', '17', '2607', '4967', '6333', '1867', '1079', '9663', '1241', 'v', 'b', '5725', 'S', 'T', 'J', 'C', '5275']
Example Output:
48724