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:
['4949', '2459', 'n', 'f', 'n', 'v', '8421', '1519', '4859', 'c', '9923', '2829', 'K', '4937', 'W', 'R']

Ex Output:
39896


Ex Input:
['m', '4645', '711', 'l', '5085', '8989', '2387', 'n', 'V', '1613', '4011', '3261', 'p', 'X', '349', 'e']

Ex Output:
31051


Ex Input:
['1839', 'D', '995', '6173', '1593', '3255', 'h', '3993', '541', '917', '1727', 'O', 'U', 'l', 'S', '9677', '8513']

Ex Output:

39223