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: ['w', '2281', '8651', '2203', 'q', 'n', '4253']

Answer: 17388


Question: ['211', '7561', '8725', '6139', 'I', '6585', '4231', 't', '2983', 'T', 'S', '9569', 'R', 'b', 'N', 'X', '9009']

Answer: 55013


Question: ['x', '9845', 'C', '3693', '7', 'b', 't', '6855']

Answer:
20400