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: ['9211', '1889', '7371', '9649', 'b', 'y', 'q', 'a', 'i', '1137', '3291', '8625']

Answer: 41173


Question: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']

Answer: 15717


Question: ['L', '2635', '4437']

Answer:
7072