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:
['543', '8351', 'I', 'M', '6647', '731', 'b', 'r', 'l', '3935', 'k', 'z', 'v', '2131', '7781', 'X', '9419', '5013', 'F']
answer:
44551


question:
['773', 'e', '4451', 'S', 'I', 'r', 'e', 'V', 'Q', 'g', 'J', 'L', '7655', 'O']
answer:
12879


question:
['Y', 'D', '3999', 'J', 'a', '2283', '639', '3669', '6447', 'G', '215', 'c', 'M', 'V', '509', 'q', '1135']
answer:

18896