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.

['N', 'V', 't', 'X', 't', 'M']
0

['Q', '1767', '5523', 'I', '933', 'h', '2189', 'f', '7795', 'X', 'M', 'G', '1215', 'W', '8619']
28041

['l', 'h', 'N', '1909', 'O', '1653', '4489', '4301', 'k', '8299', '4431', 'e', '7533', '2857', '1285', 'd', '9223']

45980