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.

['6867', 'x', '8481', '5091', '979', 'a', 'S', 'i', 'd', '1591']
23009

['2683', '4431']
7114

['w', '8667', 'w', 'h', '4651', '8073', 'h', 'S', 'l', 's']

21391