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:
['X', 'P', 'x', '9471', '5', 'c', 'f', '5077', '1085', '2267', 'R', 'q', '4987', '9529', 'H', 'n', 'r', 'u']
answer:
32421


question:
['L', 'w', '2783', '6993', 'd', '9173']
answer:
18949


question:
['3791', '9461', 'J', 'A', 'C', '777', 'v', 'E', '5863', 'i', 's', '1171', 'h', 'M', '451', 'f', 'W']
answer:

21514