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: ['z', 'E', 'u', '4437', '7767']

Answer: 12204


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

Answer: 14551


Question: ['9239', 'l', '9505', '3353', 'a', 'G', 'v']

Answer:
22097