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.

['w', 'I', 't', '813', 'K', '5785']
6598

['7959', '1345', '4605', '6453', 'Q']
20362

['I', 'G', 'g', '547', '3001', 'k', 'S', '2563', '3349', '8589', 'E', 'x', 'a', 'F']

18049