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: ['C', '9973', 'b', '693', 'y', 'H', 'C', 'P', 'b', 'J', 'f', 'T', '2317', 'O', '5755', '8201', 'p', 'y', '8721', 'i']

Answer: 35660


Question: ['3121', 'j']

Answer: 3121


Question: ['J', '8081', '2649', '6223', 'y', 'X', 'r', 'E', '6241', '8365', 'i', '7827', 'N', 'B', '8409', 'U', '7141', '2953']

Answer:
57889