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: ['g', 'M', 'I', 'V', '3377', '7309', '3617', 'v', '9207', 'k', '387', 'g', 'C', '4785', '1527', 'O', 'A']

Answer: 30209


Question: ['7959', '1345', '4605', '6453', 'Q']

Answer: 20362


Question: ['1291', '1341', 'E', '4105', '8373', '5731', '9115']

Answer:
29956