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:
['8109', '6811', 'f', 'l', '5869', 'm', '4657', 'y', 'P', '7983', 'o', 's', 'i', 'm', '2141', '4497']

Ex Output:
40067


Ex Input:
['s', 'g', 'Z', '8919', 'R']

Ex Output:
8919


Ex Input:
['1711', '9657', '6749', '5057', 'm', '7359', 'S', 'w', '6937', 'R', '5391', '963', '2505', 'Y']

Ex Output:

46329