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:
['s', '425', '6135']
answer:
6560


question:
['M', '4749', 'p', 'X', '2831', '7479', 'P', 'T', 'T', 'f', '5977', '5165', '7397', '4049']
answer:

37647