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:
['s', '3607', 'p', 'P', '9285', 'J', 'l', '9863', '9823', '2817', 'g', '9751', '599', '2605', 'k', 'Y', 'O', 'U', '9649']

Ex Output:
57999


Ex Input:
['6321', 'M', 'd', '3673']

Ex Output:
9994


Ex Input:
['w', '885', 'a', '279', '2015', 'V', 'y', 'L', '7937', '5319', 'L', 'U', '4673', 'n', '8075']

Ex Output:

29183