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: ['8667', '4129', '7075', '6345', '1315', 'M', 'F', '9073']

Answer: 36604


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

Answer: 33575


Question: ['5529', 'C', '6777', '263', '7539', 'U', 'u', '2831', '7025']

Answer:
29964