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: ['x', '5259', 'T', 'L', 'C', 'H', '2493', 'u', '3851', '2439', 'U']

Answer: 14042


Question: ['A', 'S', 'c', 'I', 'M', 'P', '8739', '879', '1401', '3941', '4061', 'q', 'P', '2805', '4473']

Answer: 26299


Question: ['4201', '6445', '4009', 'q']

Answer:
14655