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.

['p', '4689']
4689

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

['7335', 'k', 'F', '261', 'L', '95', 'N', '8395', '6525', 'q', '8771']

31382