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: ['1391', '1719', '8547', 'x', 'a', 'j', '6395', 't', '3421', '6607', 'M', '1645', 'H', 'x', 't']

Answer: 29725


Question: ['E', 'v', 'l', 'c', 'g', '3929', 'q', 'j']

Answer: 3929


Question: ['985', 'A', 'v', 'D', 'F', 'c', 'O', 'B', '3507', 'R', 'N', '3727']

Answer:
8219