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.

['457', '173', '6807', 'o', '555', 'l', 's', 'Z', 'm', '3035', '1283', '5645', 'S', '8641', 'J', 'Z', 'z', 'K']
26596

['3107', 'D', '9595', '8807', 'Q', 'o', 'T', 'N', 'A']
21509

['5303', '6707', 'G', '2843', '4771', '5995', 'U', 'p', 'L', 'A', '459', '1165']

27243