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:
['7293', '2619', '2459', '3829', 'J', 'c', 'a', 'a', '311', 'x', 'r', '6123', '2847', '4809']
answer:
30290


question:
['1067', '6397', '8451', '4205', '6109', 'y', '7927', 'Y', '2761', '1147', 'p', 'c', 'q', '9137', '7615', 't', '1563', '4661', 'q']
answer:

61040