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.

['M', 'F', '4477', '1565', '4407', 'r', 'v', '7237', '83', '5243', 'O', 'z', 'W', '7703', 'Q', 'i', '9657', 'n']
40372

['U', '5607', 'Q', 'j', 'I', '3745', '3031']
12383

['8949', 'Q', 'K', '7585', 'N', '1603', '2131', 'O', 'T', 'I']

20268