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: ['U', 'd', '893', 'h', '9679', '315', 'H', '339', '2381', '847', '7951', 'e', '9269', '9081', 'o', '6439', 'N', '4531']

Answer: 51725


Question: ['8809', '4559', '2715', 'w', '9903', 'h', 'u', 'F', '9369', '6149']

Answer: 41504


Question: ['4655', 'j', '6149', 'A', 'O']

Answer:
10804