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.

['f', 'H', 'U', 'l', 'n', 'q', '2701', '339', 'X', 'H', 'O', 'q', '2313']
5353

['9211', '1889', '7371', '9649', 'b', 'y', 'q', 'a', 'i', '1137', '3291', '8625']
41173

['8449', 'r', 'U', '8113', 'q', '8143', '5057', 'P', '8129', 'w', '8133', '1657']

47681