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: ['W', 'c', 'P', '425', '4133', 's', '1831', '883', '2531', '681', 'U', 'B', 'H', '237', '4245']

Answer: 14966


Question: ['E', 'X', 'C', 'v', '2803', 'g', 'b', '763']

Answer: 3566


Question: ['X', 'p', '8881', 'Y', 'F', '261', 'O', 'm', 'y', '1145', 'q', 'g']

Answer:
10287