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.
--------
Question: ['8529', '2657', '1599', 'b', '8187', '7005', '7481']

Answer: 35458


Question: ['v', 't', 'a', 'r', 'O', 'I']

Answer: 0


Question: ['6325', 'B', 'W', 'H', '6085', '1513', 'G', 'c', 'M']

Answer:
13923