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: ['D', 'm', 'P', '2433', '6731']

Answer: 9164


Question: ['Z', '6245', 'N', '1403', 'b']

Answer: 7648


Question: ['8703', '3473', 'p', 'E', '8077', 'V', '3779', 'T', '3225', 'd', '7509', 's', 'Z', '3247']

Answer:
38013