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: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']

Answer: 27674


Question: ['w', '4181', 'g', 'j', '1823', 'q', 'i', '709']

Answer: 6713


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

Answer:
14551