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: ['P', '6161', 'k', '5925', 'h', 'G', 'n']

Answer: 12086


Question: ['2039', '1679', '9675', 'S', 'J', '2069', 'r', 'e']

Answer: 15462


Question: ['1319', '6105', '1119', 'c', 'p', '7617', '5113', 'a', '5115', '6731', '6693']

Answer:
39812