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: ['k', 'Z', 'r', 'K', 'b', 'X', 'A']

Answer: 0


Question: ['3331', '5791', 'r', 'Q', '2243', '8229']

Answer: 19594


Question: ['3567', 'l', 'l', 'Y', 'M', 'I', '3135', '8363', 'q', 'C', 'c', 'R', '6953']

Answer:
22018