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:
['135', 'a', 'X', '8067', '8447', '4009', '4221', 'o', 'A', 'x']
answer:
24879


question:
['Q', 'v', 't', '223', 'm', 'l', 'c', 'M', 'b', '2227', 'P', 'e', 'n', 'f', 'S', '2205', '3517', '5545']
answer:
13717


question:
['251', '2155', '5029', 'k', 'j', 'I']
answer:

7435