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.

['2775', '7405', 'F', 'D', '9025', '827', 'e', 'j', 's', 'e', 'Q', '1137', 'G']
21169

['e', 'K', 'A', 'V', '1169', 'n', '8729', 'V']
9898

['s', 'R', 's', '7347', '6509']

13856