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:
['4145', 't']
answer:
4145


question:
['3873', 'D', 'J', '2799', 'k', 'F', 'I', '3457', '5647', '4815', '7509', 'Y', '1251', '2211']
answer:
31562


question:
['s', '703', 'r', 'p', 'E', 'S', 'u', 'U', '9215', 'w', 'm', 'T', '3615', 'h']
answer:

13533