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:
['D', '1259', '8927', '3345', '553', '7209', '2507', 'l', 'o', '7317', '1227', '6749', 'S', '3171', 'I', '197', '9577', 'j', 'Q']

Ex Output:
52038


Ex Input:
['7231', '2813', '51', '1745', 'c', 'a', '4929', '3185', '5707', '2095', 'f', 'S']

Ex Output:
27756


Ex Input:
['a', 'm', '3205', '1869', '1117', 'K', '5785']

Ex Output:

11976