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: ['7277', 'c', '9587', '2613', '853', 'w', 'y', '4067', 'o', 'u', 'j', 'W', '1517', 'x', 'Y']

Answer: 25914


Question: ['l', 'B', 'Y', '7543', '5091', '1917']

Answer: 14551


Question: ['5247', 'Y', 'q']

Answer:
5247