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:
['5715', 'r', 'R']
answer:
5715


question:
['v', 'Y', '4135', '8645', '263', '5377', '8677', 'Z', 'W', 'g', 'n', 'r', 's', '8513', '5677', 'u', '3033', 'I']
answer:
44320


question:
['f', '2609', '4553', 'S', 'l', '3379', '3393', '2443', 'y', 'L', '5893', 'Y', 'J', 'D', '9953', 'I', 'q']
answer:

32223