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.
['V', 'A', '1823', '695', 'C', 'K', '3887', '1483', '6221', '5917', '4189', 'o', '9477', '5387', '2427', 'P', 'd', '7763', 'I', 'q']