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.

['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']
30645

['J', '177', '8449', '2067', 'a', 'G', 'p', 'd', '5161', 'M', '2403', '5541', 'q', '4375', 'O']
28173

['3323', 'l', 'W', 'N', '6151', 'U', 'B', '7181', 'e', 'o', '2297']

18952