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:
['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']

Ex Output:
21910


Ex Input:
['D', 'R', 'Y', '4929', 'P', '7929']

Ex Output:
12858


Ex Input:
['9521', 'N', '8107', 'a', '1911', 'D', '3089', 'g', '2691', 't']

Ex Output:

25319