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:
['6019', '1467', '3415', '7785']
answer:
18686


question:
['7831', 'O', '6017', 'v', 'U', '5761', 'Q', 'Q', 'w', '8465', 'Z', 'P', 'i', 'u', '1635', 'n', '8471', '4213']
answer:
42393


question:
['t', '8565', '8583', 's', 'f', 'j', 'q', 'B', '4197', 'F', 'T', 'e', '8997', '4423']
answer:

34765