instruction:
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:
['f', 'F', 'E', '2279', 'r', '6419', 'd', 'M', '3975', '3797', '9201', 'F', 'c', '4753', '959', 'v', '8963', '4007']
answer:
44353


question:
['R', 'C', 'S', 'x', '1529', 'r']
answer:
1529


question:
['e', '9251']
answer:

9251