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:
['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']
answer:
23009


question:
['4177', 'd', 'b', 'm', 'f', 'R', '797', '7905', '4355', '7515', '9801', 'F', 'R', '9125', '8445', 'k', 'K', 'K']
answer:
52120


question:
['9639', '7795', '5841', '6559', 'C', 'V', 'j', '8755', 'C', '4899', 'h', '4755', 'G', 'E', '9289', '7197', 'W', 'b', 'R']
answer:

64729