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:
['t', '7469', 'Y', 'N', '8137']
answer:
15606


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


question:
['8947', '57', 'b', 'w', 'L', '3633', 'I', '5261', '2071', 'j']
answer:

19969