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.

['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']
41788

['6121', 'S', '8683', 'Y', '6107', 'B', '6193', '5555', '365', '945', '1439', '7257', 'g']
42665

['4617', 'k', '1487', 'A']
6104