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

['E', 'v', 'l', 'c', 'g', '3929', 'q', 'j']
3929

['4977', '2605', 't', 'R', 'e', 'L', 't', 'r', 's', '5083', 'z']

12665