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: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']

Answer: 5636


Question: ['w', '1335', 'G', 'h', '6729', '1999', 'u', 'I', 'r', 'm', '4757', 'W', '3715', '701', '1999']

Answer: 21235


Question: ['3633', 'E', 'F', 'm', '7141', '7519', '4251', 'i', '4863', 'o', '7449']

Answer:
34856