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

['w', '2281', '8651', '2203', 'q', 'n', '4253']
17388

['i', '6033', '9257', '3575', '1129', '3715', '6331', 'S', 'k', 'V']

30040