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: ['6469', '3027', 'Z', '3353', 'a', 'S', '3879', '8471', 'H', 'I', 'y', '2661', '9007', 'D']

Answer: 36867


Question: ['q', '5151', 'R', '441']

Answer: 5592


Question: ['R', '2067', '7127']

Answer:
9194