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: ['2871', '1337', '3771', '4671', 'l', '3785', 'V', 'z', 'R', 'u', '6097', 'R', '4297', 'd', '6339', 'Y', 'V', '5873', '7399']
Example Output: 46440

Example Input: ['s', '407', '7983', '1523', '8983', '9841', 'p', 'y', 'N', '7633', 'T', '4177', 'Z', 'Y', '3223', '7125', '2601', '7467', '3039']
Example Output: 64002

Example Input: ['8491', '8683', 'M', 'e', '9561', '5765', 'j', 'w', 'I', 'x', '3601', '8551', '6405', '5633', '1133']
Example Output:
57823