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: ['2775', '7405', 'F', 'D', '9025', '827', 'e', 'j', 's', 'e', 'Q', '1137', 'G']

Answer: 21169


Question: ['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

Answer: 27157


Question: ['D', 'g', '1845', 'e', 'z', '3457', 'e', 'G', 'P', 'i', 'e', '8983', 'U', 'c', 'A', 'I', '6371', '8443', '1683', 'd']

Answer:
30782