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', 'Z', 'r', 'K', 'b', 'X', 'A']
0

['8763', 'k', '3653', 'v', 'd', 'D', 'm', '1037', 'c', 'F', '2349', '7843', '3259', 'v', '5555', '7565', '8137', 't']
48161

['377', 'c', 'a', '4377', 'F', 'e', 'I', '345', '9893', 's', '6245', 'J', 'm', '6539', '6761', '6593']

41130