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: ['7215', 'd', 'q', 'k', '9301', 'P', 'x', 'C', 'g', 'e', 'o', '2769', '6993', '9769', 'v', '9007', '4131', '8627', 'q']

Answer: 57812


Question: ['D', 'R', 'Y', '4929', 'P', '7929']

Answer: 12858


Question: ['4321', '5641', '5599', 'e', '1821', 'Z', '4741', '9055', 'K', '4523']

Answer:
35701