Detailed Instructions: 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.
Q: ['F', 'o', '263', 'n', '6589', '5579', '8657', 'T', 'P', '17', '3853', '4309', '5747', 'B', 'd']
A:
35014