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: ['Q', '2271', '1803', '2363']

Answer: 6437


Question: ['2237', '2597', '2593', 'Y', '5345', 'g', 'l', 'I', 'p', 'u', 'L', 'T', '617', '9759', 'b', 'w', '7097', '9863']

Answer: 40108


Question: ['1545', 'B', 'K', 'D', '2333']

Answer:
3878