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:
['s', 'M', 'U', '5383']
answer:
5383


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


question:
['7393', 'U', 'R', 'v', '1551', 'b', '4037', 'U', '7433', 'V', '2643', '6451', 'F', 'P', '9891']
answer:

39399