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: ['9403', '2607', 'G', '7901', 'K', '7967', 'a', 'n', '1967', 'x', 'g', '1081']

Answer: 30926


Question: ['n', '6729', 'p', 'D', 'o', '1213', 'e', '6951', '2341', '9997', 'e', 'M', 'x', 'R']

Answer: 27231


Question: ['k', 'c', 'm', 'R', 'w', 'z', 'G', 'V', 'h', 'i', '25', '6097', 'U', 'p', 'N']

Answer:
6122