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.

Q: ['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']

A: 34296
****
Q: ['4811', 'Q', '2289', 'N', 'I', '7681', 'z', '8179', '3359', '5299', 'R', 'z', '8697', '5781', '4803', '2715', '6511', '1371']

A: 61496
****
Q: ['C', 'Y', 'Q', 'O', '7789', '4513', 'c', 's', 'N', '9557', '9893']

A:
31752
****