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:
['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']
answer:
24755


question:
['X', 'f', 'p', 'R', 'N']
answer:
0


question:
['x', 'f', 'l', 'm', '2325']
answer:

2325