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: ['D', 'P', '9951', '2897', 'V', 'C', 'B', 'H', 'c', 'h', '2843', 'a']

Answer: 15691


Question: ['7763', '6003', 'V']

Answer: 13766


Question: ['o', '3897', 'v', '945', '5635', '3611', 'b', '4017', '1835', 'v', '8091', 'R', '6655', '2725']

Answer:
37411