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: ['6165', 'x', 'u', 'n', 'V', 'B', '4039', 'l', '991', 'x', '335', '9011', 'K', '8725', 'a', '6291', 'j']
Example Output: 35557

Example Input: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']
Example Output: 26791

Example Input: ['3433', '6955', 'Q', 'E', '3557', 'S', '2931', '9879', 'S', 'f', 'Q']
Example Output:
26755