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: ['2923', '3573', '6179', '7673', '6551', 'B', '315', '5169', 'm', '9405', 'm', 'Z']

Answer: 41788


Question: ['4869', 'L']

Answer: 4869


Question: ['7869', 'd', 'E', '2405', '6441', 'R', 'g', 'E', 'p']

Answer:
16715