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.
--------
Question: ['9989', 'B', 'E', '5181']

Answer: 15170


Question: ['u', 'W', '1561', '9243', '4923', '9385']

Answer: 25112


Question: ['4159', 'H', 'h', 'W', 'w', 'i', 'G', 'l', 'j', '5467', '9219', 'j', 'q', 'n', '5465', '6197', 'J', 'y']

Answer:
30507