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.
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Question: ['c', '4501', 'O']

Answer: 4501


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

Answer: 30926


Question: ['c', '4631', '2479', 'L', '4057', 'H', 'F', 'q', '4787', '9671', 'p', '7421', '4781', 'e', '2323', 'N', 'C']

Answer:
40150