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:
['7459', '491', '7823', '6965', 'H', '109', 'R', 't', '3959', '2821', 'R', '2807', 'o', 'v', '1305', 'a', '1411', 'r', '3669']
answer:
38819


question:
['9869', '7701', 'H', 'o', 'v', '1431', 'O', 'L']
answer:
19001


question:
['f', '3733', 's', 'L', '1093', '3185', 'f', 'y', 'S', 'y', '7511', '6443', '1825']
answer:

23790