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: ['1969', 'm', 'Y', 'N', '7331', 'J', 'b', '2485', 'x']

Answer: 11785


Question: ['k', '1489', 'x', '6543', 'I', 'l', 'D', '6299', '1473', 'a', '7661', 'z', 'E', 'Z', 'U', '3671', '2873', 'e', 'p']

Answer: 30009


Question: ['981', 'C', 'x', '1195', '9933', '9135', 'g', '3985', 'I', 'Q', '7927', 't', 'G', 'D', 'A', '2777']

Answer:
35933