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

Answer: 12302


Question: ['o', 'a', 'K', '6031']

Answer: 6031


Question: ['3839', 'D', '4741', 'L']

Answer:
8580