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', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
30645

['2097', '7815', 'f', '1705', '7553', 'C', 'n', '7091', '1253', 'z', '9229', 'H', 'N', '6481', 'H', 'M', 'G', '4527', '8537']
56288

['A', 'y', 'u', 'S']

0