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.

['z', 'U', '6817', 's', '3731', 'M', 'I', '1095', 'l', '5993', '5207', 'e', 'L', '5361', 'v', 'g', '1963', '4829', '9541', '8261']
52798

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

['3647', 'u', '5563', '2255', '1487', 'w', '9751', 'T']

22703