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:
['y', 'p', '3553', '2155', 'b', 'R', 'j', 'V', 'U']

Ex Output:
5708


Ex Input:
['r', '3537', 'T', '3611', 'k', '4983', 'h', '4317', '8727', 'E', '6471', '8465', 'f', '5429', 'T', '2169', '2171', 'P', '6941', 'D']

Ex Output:
56821


Ex Input:
['M', 'd', '1445', '5597', 'E', '8683', '3259', '959', 'b', '1763', 's', 'l', 'F', '1609']

Ex Output:

23315