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: ['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']

Answer: 50667


Question: ['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']

Answer: 9898


Question: ['751', 'x']

Answer:
751