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.

['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']
23791

['A', 'y', 'u', 'S']
0

['1519', '5287']

6806