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:
['9787', '1491', '4411', '5261', 'U', '9787', 'b']
answer:
30737


question:
['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']
answer:
24879


question:
['B', 'v', 'v', '8645', 'X', '8191', 't', 'q', '3483', 'N', 'H', 'j', 'u']
answer:

20319