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.
--------
Question: ['3051', '5343', 'k', 'k', '6815', 'E', '4745', 'A', 'A', '1251', '6649', 'f', '4133', 'X']

Answer: 31987


Question: ['q', '6631', 'b', '4207', '7523', '9853', '9203', 'P', '5029', 'b', '2319', '4717', '2485']

Answer: 51967


Question: ['O', 'Q', 'O', '511', '4699', '5251', '5629', 'm', 'f', 'h', '8321', '353']

Answer:
24764