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: ['8669', '9115', '2573', '9261']

Answer: 29618


Question: ['5289', '1701', '5925', '7973', 'F', 'V', 'y', '5903', 'i']

Answer: 26791


Question: ['6999', 'P', 'L', 'Q', '3347', 'R', 'p', 's', '163', '1129', 'U', 'Q', 'L', '2177', '7981', 'Q']

Answer:
21796