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: ['6957', '4603', '5299', '8451', '9803', 'b']

Answer: 35113


Question: ['m', '4645', '711', 'l', '5085', '8989', '2387', 'n', 'V', '1613', '4011', '3261', 'p', 'X', '349', 'e']

Answer: 31051


Question: ['8715', '6865', '341', 'U', '2843', '669']

Answer:
19433