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: ['D', 'K', 'n', 'd', 'i', 'U']

Answer: 0


Question: ['V', '2633', '3269', 'r', 'Q', '3517', '2571', 'G', '4105', 'm', 'z', 'B', 'A']

Answer: 16095


Question: ['5047', 'f', '2365', 's']

Answer:
7412