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: ['D', '9679', 'e', '5537', 'G', 'l', '2653', 'a', 'Y', '8467', 'q', 'L', '7239', 'O']

Answer: 33575


Question: ['X', '989', 'U', '9551', '6385', 'Y', '1433', 'J', '1833', '685', 'u']

Answer: 20876


Question: ['d', '3221', '1285', '5031', 'd', 'j', 'b', 'q', '4549']

Answer:
14086