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: ['61', '5695', 'u', '253', 'n', '1035', 'd', '3017']

Answer: 10061

Question: ['Q', '8317', '8989']

Answer: 17306

Question: ['i', '5831', '2745', '413', '1513', '5489', 'n', '3001', '3201', 'X', '9321', '3909', '4999', 'r']

Answer:
40422