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:
['j', 'f', '3831', 'B', 'D']
answer:
3831


question:
['2683', '4431']
answer:
7114


question:
['383', '3163', '7175', 'v', 'i', 'm', 'd', 'b']
answer:

10721