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:
['s', '425', '6135']

Ex Output:
6560


Ex Input:
['n', 'W', '565', '6625', '903', 'o', '7995', '8339', '5251', 'e', 'a', '1081', '5813', 'o']

Ex Output:
36572


Ex Input:
['P', '6515', '7323', 'j', 'a', 'j', 't', '3091', '3273', '4661', 'U', '3979', '2481', '2307', '6199', 'H', 'K', '1023', 'l']

Ex Output:

40852