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: ['29', 'N', '5061', '7191', 'z', '8367']

Answer: 20648

Question: ['901', '1939', '7637', '8863', 'X', '5003', '8791', '4757', 'E', '1525', 'y', '9735']

Answer: 49151

Question: ['Y', 'D', 'S', 'm', '517']

Answer:
517