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: ['8113', '203', '5413', '2647', '7499', 'K', 'F', 'n', '1189', 'y', '9843', 'h', 'm', 'R', '6433', 'z', 'D']
A:
41340