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:
['4241', 'E', '1807', '2877', '5125', '7625', 'S', '401', '5081', 'u', 'R', 'F']

Ex Output:
27157


Ex Input:
['8609', '8045', '2517', '3821', 'x', '3895', 't']

Ex Output:
26887


Ex Input:
['1481', '3039', '3593', '8689', '7973', 't', 'e', 'F', '7755', 'P', 'T', 'T', '1319']

Ex Output:

33849