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:
['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']

Ex Output:
24201


Ex Input:
['8871', '1297', 'W', 'f', 'Y', '8731', '113', '6707', '379', '9631', 'X', 'C', 'q']

Ex Output:
35729


Ex Input:
['7771', '4021', '557', '6851', '5435', 'b', '7727', 'k', 'c', '1107', '1695', '687', 'n', '8877', '8877', 'n']

Ex Output:

53605