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.

Ex Input:
['G', 'e', 'R', '4427', '3401', '3065', 'I', '2781', '6829', '5261']

Ex Output:
25764


Ex Input:
['901', 'X', 'W', 'D', 'm', 'M', '59', '4855', '6523', 'R', '9781', '8271', '4449', '2221', '8391']

Ex Output:
45451


Ex Input:
['6539', '7797', '9255', 'r', 'w', '2095', '9269', '7851', '2981', 'w', '9787', '5817', 'g']

Ex Output:

61391