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:
['r', 'B', '8791', '3165', 'n', 'm']
answer:
11956


question:
['4975', 'M', 'C', 'D', 't', 'i', 't', 'L']
answer:
4975


question:
['4387', 'j', 'o', 'q', 'a', 'i', '7085', '7943', 'K', 'y', 'N', 'W', 'S', '3425', 'w', '7733', '8505']
answer:

39078