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: ['4145', 't']

Answer: 4145


Question: ['q', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']

Answer: 14871


Question: ['R', 's', 'U', '6035', '8061', 's', '4197', '8683', '247', 'E']

Answer:
27223