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:
['Q', '6383', 'P', '8455', '3881', '5821', 'e', 'v', '1421', 'Q', '6377', '3157', '6407', 'q']
answer:
41902


question:
['3557', '3345', '307', '9791', '1897', 'O']
answer:
18897


question:
['n', '313', 'g', '6375', 'f', 'R', '4257', 'D', 'Q', 'j', 'Q', '3667', 'g', 't', 'd', 'b', '8761']
answer:

23373