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:
['D', 'm', 'P', '2433', '6731']
answer:
9164


question:
['v', '3135', 'J', 'm', 'a']
answer:
3135


question:
['u', 't', 'c', '4453', '1953', '1731', 'f', 'U', 'e']
answer:

8137