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: ['z', 'T', 'Y', 's', 'j', '585', '7833', '2601', '8057', 'S', '7037', '5799', '4477', '5377', '6301', 'P', 'm', '9431', 'f']

Answer: 57498


Question: ['3331', '5791', 'r', 'Q', '2243', '8229']

Answer: 19594


Question: ['6807', 'E', 'c', 'k', 'G', '3825', 'O', '6123', '2171']

Answer:
18926