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:
['5573', '6221', 'C', '8649', '6603', 'q', '9403']
answer:
36449


question:
['D', 'K', 'n', 'd', 'i', 'U']
answer:
0


question:
['4463', 'L']
answer:

4463