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: ['4533', 'D', '823', 'a', 'x', 'p', '9787', '2587', 'T', 'Z', '2207', '8719', 'F', '7675', 'T', '2777', '203', 'N', 'o']

Answer: 39311


Question: ['s', '425', '6135']

Answer: 6560


Question: ['3711', '893', '8951', '8093', 'u']

Answer:
21648