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: ['K', 'O', 'p', '1669', '8647', '3417', 'a', '8903', 'V', 'E', 'l', 'a', '5177', 'J', '6559', '5377', 'X', '9427']

Answer: 49176


Question: ['o', '445', '2601', 'h', 'V', 'C', 't', 'o', 'H', '3707', '7601']

Answer: 14354


Question: ['u', '4253', 'J', '749']

Answer:
5002