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:
['Q', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']

Ex Output:
13717


Ex Input:
['q', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']

Ex Output:
14871


Ex Input:
['f', 'M', 'N', '245', 'w', '439', '4977', '2137', '6015', 'P', 'm', 'b', '4477', 'c', '9635', 'X', 'v']

Ex Output:

27925