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:
['3051', '5343', 'k', 'k', '6815', 'E', '4745', 'A', 'A', '1251', '6649', 'f', '4133', 'X']
answer:
31987


question:
['c', '2255']
answer:

2255