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.

['c', 'd']
0

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

['7047', 's', '5771', '6515', 'S', '8793']

28126