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:
['q', '5151', 'R', '441']
answer:
5592


question:
['8517', 'B', '9359', '5947', 'V', '3055', '1925']
answer:

28803