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: ['7293', '2619', '2459', '3829', 'J', 'c', 'a', 'a', '311', 'x', 'r', '6123', '2847', '4809']

Answer: 30290


Question: ['1693', '9237', '7591', '1593', 'R', '6295', '9379']

Answer: 35788


Question: ['513', 'K', '5745', '8203', 'f', '3377', '4899', '1683', 'T', 'K', 'd', '6445', '4801', '1173', 'k', 'q', '751', 'x']

Answer:
37590