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: ['D', 'K', 'n', 'd', 'i', 'U']

Answer: 0


Question: ['6563', 'R', 'M', 'B', 'b', 'E', '9911', '7327', 'J', '7389', 'w', 'b', 'c', '1527', 'K', 'r', '5441', '6823', '8455']

Answer: 53436


Question: ['v', 'r', 'd', '4831', '5329', 't', '9055', '2821', '4765']

Answer:
26801