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.

['6367', '9923', '9141']
25431

['M', '6989', 'I', 'w', '3591', '3067', '3883', 'C', '6049', '5723', 'j', '5989', 'C', 'R', '475', '7779', '671']
44216

['a', '4135', 'L', 'a', 'L', '8041', 'k', 'e', '1793']

13969