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:
['8739', 'K']
answer:
8739


question:
['W', 'O', 'c', 'r', 'E', 'w', '9811', '6421', '3543', '4293', '8255', 't', '229', '745', 'w', 'p', '6861', '5305', 'h']
answer:
45463


question:
['6267', '7707', 'N', 'K', 'S', 'Y', '3899', '5719', '7237', 'G', 'h', 'o']
answer:

30829