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:
['Q', '8317', '8989']
answer:
17306


question:
['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
answer:
33509


question:
['K', 'T', '7911', 'l']
answer:

7911