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:
['M', 'H', 'l', 'Y', '3811', '1953', '5869', 'U']

Ex Output:
11633


Ex Input:
['i', 'A', 'a']

Ex Output:
0


Ex Input:
['5689', 'j', 'K', 'i', 'U', 'l', 'B', 'a', 'I', '3235', '9289', 'M', 'F', '7789', '8733', '5477', 'F', '1719', '5491']

Ex Output:

47422