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:
['W', 'c', '7971', 'J', 'o']
answer:
7971


question:
['s', 'g', 'Z', '8919', 'R']
answer:
8919


question:
['5993', '5767']
answer:

11760


