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: ['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']

Answer: 48859


Question: ['3705', '9217', 'C', '4609']

Answer: 17531


Question: ['y', 'j', 'I', 'g', 'V', '7065', '3183', 'k', '8073']

Answer:
18321