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: ['6551', 'm', '3941', 'F', 'K', 'u', '7981', '9581', 'X', 'M', 'N', 'e', 'G', 'i']

Answer: 28054


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

Answer: 11633


Question: ['Z', '4531', 'J', 's', 'F', 'i', '8895', '9903', '1587', 'r', '2187', '1845', '2153', '1745', 'j', 'c', 'N', 'F', 'U', 'k']

Answer:
32846