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: ['D', 'C', '7295', 'g', 'j', '1387', 'O', '4701', 'B', 'd', 'W', 'b', 's', 'n', 'n', '4917', '2941', '1825', 'x']
Example Output: 23066

Example Input: ['h', '6937', 'U', 'f', 'S', 'm', '9699', 'E', '4559', 'p', 'Z', 'o', '6409', 's', '4537', '5135', '6901', '6489', '5833', 'l']
Example Output: 56499

Example Input: ['791', '833', 'u', '225', 'E', '7877', '2593', '2295', '6971', '4871', '9729', 'z', '3063', 'A']
Example Output:
39248