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', 'h', '5549', 'K', 's', '8337', 'Y', '497', 'z', 'T', '4467', '6333', 'M', '1573', 'y', 'O', '5499', 's', 't', '6205']
38460

['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']
15691

['777', 'l', '9077', 'V', '4973']

14827