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: ['A', '9775', '5867', 'n', '1329', '5973']

Answer: 22944


Question: ['3469', 'n', '5561', '8597', '921', '4737', 'r', 'P', '7127', '3651', 'D', '1703', 'y']

Answer: 35766


Question: ['e', '4243', '1703', '3227', '3123', 'c', 'L', '9553', '9295', '9181', '1983', 'k', 'k', '571', '7409', '3373', '3785', '6031', 'g']

Answer:
63477