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:
['c', '7415', '6253', '4477', 't', '9449', '7733', '2325', 'Z', '5413', 'q', 'm', 'R', '8619', '7289', '857', '7273', '7425']
answer:
74528


question:
['D', '5207', 'E', '119', 'g', '2991', 'G', 'g', 'u']
answer:
8317


question:
['2073', 'X', 'F', 'Q', '1665', 'U', 'N', 'K', 'w', '6497', '7131', '7143', '5803', 'P', '185', '8883', '7043', '4571', '5447']
answer:

56441