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: ['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']

Answer: 14215


Question: ['5347', 'E', 'a', '5379', '405', '1171', 'v', 'J']

Answer: 12302


Question: ['l', 'S', '6083', '5337']

Answer:
11420