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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

Answer: 15614


Question: ['83', 'k', 'p', 'o', 'b', '7819', '2089', '4141', 'c', 's', '6045', '6783', 'J', 'B', 'x', 'O', 'X', '9693']

Answer: 36653


Question: ['J', '621', '4711', 'a', '3851', '6213', 'S', 's', '5219']

Answer:
20615