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:
['N', 'V', 't', 'X', 't', 'M']
answer:
0


question:
['6585', '5263', '9497', '1117', 'a', 'F', 'w', '6595', '547']
answer:
29604


question:
['9383', '5871', 'P', '9789', '6259', 'i', 's', 'b', '6319', 'N', '1135', 'L', '6291', 'M', '2287', '4719']
answer:

52053