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', '9377', '3663', '1375', 'j', 'L', '7943', '1711', '7409', '9115', '1227', 'I', 'U']

Ex Output:
41820


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

Ex Output:
6560


Ex Input:
['793', '8131', 'L', '8335', 'K', 'A', 'K', '4887', '1889', '1257', 'b']

Ex Output:

25292