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: ['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']

Answer: 59148


Question: ['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']

Answer: 24755


Question: ['4809', 'y', 'y', 'Z', '6747', '1165', 'u', '9929', 'u']

Answer:
22650