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:
['M', 'H', 'l', 'Y', '3811', '1953', '5869', 'U']
answer:
11633


question:
['8669', '9115', '2573', '9261']
answer:
29618


question:
['t', '6411', 'E', 'u', 'Q', '3951', 'b', '4385', '3545', '2421', '2981', '9805', 'g', 'E', 'P']
answer:

33499