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.

['K', '4403', 'a', '3881', '4139', 'w', '1861', 'G']
14284

['d', '6851', 'o', '5521', 'l', '3911', 'w', '1005', 'e', '3323', 'r', '7311', '4377']
32299

['f', '6359', '7419', '9785', 'R', 'F', 'M', '4925', '6603', 'x', '2433', 'r', 'M', 'V', 'M']

37524