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: ['7087', 'P', 'i', 'e', '4875', 'e', 'F']

Answer: 11962


Question: ['M', '5201', '2787', 'z', '9465', 'X', 'X', '4017', '8305', 'y', '6897', 'y', '6045', '9863', 's', 'd', '3611', 'l', 'd']

Answer: 56191


Question: ['5903', '2503', '8387', '7135', '9145', 'm', '4583', '9399', 'X', '6941', 'x', '6049', '3105', 'o', '3179', '3877', '2409', 'q']

Answer:
72615