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: ['8755', 'A', '2893', '6703']

Answer: 18351


Question: ['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']

Answer: 47287


Question: ['9849', 'Z', '87', 'f', 'K', '7', '7937', '4571']

Answer:
22451