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:
['Q', '2271', '1803', '2363']

Ex Output:
6437


Ex Input:
['6907', '9123', 'L', '8871', 'q', 'C', 'U', '7403', 'F', '3827', '3951', '8879', '2865', 'x', '6175', 'T', '1147']

Ex Output:
59148


Ex Input:
['1587', '6105', '5843', '1147', '1629', '6909', '6657', '9993', '7461', 'x', 'x', '6337', 'o', 'G', 'U', 'u', '569', '4737', 'f']

Ex Output:

58974