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.

['v', 't', 'a', 'r', 'O', 'I']
0

['R', 'C', 'S', 'x', '1529', 'r']
1529

['o', '67', '7167', 'b', '8209']

15443