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: ['8591', 'J', 'l', 'l', '7023', 'N', 'n']

Answer: 15614


Question: ['Q', '4723', '3595', 'm', '4035', 'j', 'W', 'c', '3375', '8637', 'v', 'o', 'b']

Answer:
24365