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: ['597', 'i', 'd', '3201', 'u', '1111', '8563', 'c', 'E', '5983', '6293']

Answer: 25748


Question: ['n', 'u', '9595', 'M', 'o', 'K', '5073', 'x']

Answer: 14668


Question: ['9313', '6859', '4393', 'k', '8451']

Answer:
29016