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', 'C', '7295', 'g', 'j', '1387', 'O', '4701', 'B', 'd', 'W', 'b', 's', 'n', 'n', '4917', '2941', '1825', 'x']

Answer: 23066


Question: ['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']

Answer: 24879


Question: ['M', 't', '7681', 'E']

Answer:
7681