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:
['d', '7305', '8903', 'b', '7687', '6393', '6939']
answer:
37227


question:
['7755', '8383', 'y', 'k', '4869', '2809']
answer:
23816


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

15606