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:
['j', 'f', '3831', 'B', 'D']
answer:
3831


question:
['A', '9979', '8723', '1131', 'i', 'p', 'M']
answer:
19833


question:
['2377', '7885', 'l', '8245', 'j', '6279', '6545', '6203', 'C', '2657', 'Q', '1651', 'R', '489', '3991', 'T', 'f']
answer:

46322