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', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']

Answer: 33509


Question: ['g', 'M', 'I', 'V', '3377', '7309', '3617', 'v', '9207', 'k', '387', 'g', 'C', '4785', '1527', 'O', 'A']

Answer: 30209


Question: ['9865', 'g']

Answer:
9865