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:
['z', '3199', 'r', '849', 'C', 'v', '1931', 'M', 'Q', '4531', '579', 'x', '8997', '4663']
answer:
24749


question:
['5331', 'f', '2865', '6019', 'U', 'm', 'g', 'n', 'Y', 'A']
answer:
14215


question:
['1775', 'f', 'N', 'M', 'z', 'o']
answer:

1775