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: ['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

Answer: 41788


Question: ['o', 'a', 'K', '6031']

Answer: 6031


Question: ['x', '8647', 'N', 'Q', '5759', '6747', '7735', '6311', '5329', '4115', 'S', '9125', 'w', 'q', 'T', 't']

Answer:
53768