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: ['t', 'G', '217', 'W', 'l', 'j', 'd', 'U', '6795', '1609', 'n', '6919', '617', '5753']

Answer: 21910


Question: ['6515', '5525', 'o', 'Q', '9049', 'f', 'p', 'X', '2057', 'h', '7585', '3617', '7817']

Answer: 42165


Question: ['8997', '4569', 'T', 'Z']

Answer:
13566