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

Answer: 14551


Question: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']

Answer: 12302


Question: ['C', '2067', '8633', 'M', '7475', 'q', '8387', '2641', 'N', 'm', 's', 'd']

Answer:
29203