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.

['1147', 'f']
1147

['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']
6713

['t', '6211', '1431', 'y', '357', '6403', '7935', 'y', 'n', '6931', 'o', 'K', '5579', '4869', 'D', 'L']

39716