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.

Ex Input:
['X', 'f', 'p', 'R', 'N']

Ex Output:
0


Ex Input:
['t', 'x', '5629', 'k', '2003', 'v', '541', 'l', 'v', '7983', '677', '6173', 'z', 'J', 's', 'u', '2187', 'Y']

Ex Output:
25193


Ex Input:
['5547', 'C', 'i', '9389', 'u', 'r', 'm', '3667', '2079', '5803', '4633']

Ex Output:

31118