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', 'w', '2783', '6993', 'd', '9173']

Answer: 18949


Question: ['h', '1157', 'm', '8975', '6165', '7491', '1855', '3489', '9629', '631', '9641']

Answer: 49033


Question: ['x', '9895', 'r', 'H', 'C']

Answer:
9895