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:
['P', '6299', '9655', 'l', '6317', '2139', '3347', 'l', '3095', '7363', '3115', '7529', 'R']
answer:
48859


question:
['2417', '6671']
answer:
9088


question:
['B', 'j', '5937', 'P', '9353', '4683']
answer:

19973