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: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

Answer: 48859


Question: ['5095', '8235', '4901', 's', '4177', '3077', 'l']

Answer: 25485


Question: ['k', '2023', 'O', '5145', '6523', 'F', 'p', 'a']

Answer:
13691