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: ['6161', 'p', '2839', 'c', '5905', '1729', 'j', '5901', '3013', 'e']

Answer: 25548


Question: ['U', '5607', 'Q', 'j', 'I', '3745', '3031']

Answer: 12383


Question: ['3719', 'n', 'T', '2127', '7703', 'c', 'v', 'D', '1699', 'u', '9143', '1661', '2069', '5083', 'w', 'b', 'F', '3505', '4333']

Answer:
41042