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: ['U', '9593', '2079', '5959', 'T', '5849', 'w', 'b', '9743', '6689', 'k', 'J']

Answer: 39912


Question: ['507', 'P', '9697', 'u', '5057']

Answer: 15261


Question: ['T', '8749', '5875', '3675', '265', '9547']

Answer:
28111