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.

['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']
24749

['B', 's']
0

['7361', '6913', '3605', '2081', '7619']

27579