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.
['4329', '6497', '4995', 'q', '8059', '315', '9567', 'l', '5985', '2917', '1283', 'V', '9269', '2231', 'q', 'w', 'r', '131', 'W', '4053']