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:
['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Ex Output:
35458


Ex Input:
['191', 'R', 'Q', '7809', '4851', 'b', 'e', 'H', 'E', 'I', 'r', 'A', 'g', 'e', 'g', 'I', 'j', 'f', '7287']

Ex Output:
20138


Ex Input:
['5779', 'b', '8069', '9831', '9295', 'z', 'g', '6935', 'M', 'z', 'N', 'K', 't', 'W', 'y', '1493', 'd', '1479']

Ex Output:

42881