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:
['d', '7305', '8903', 'b', '7687', '6393', '6939']

Ex Output:
37227


Ex Input:
['M', '5201', '2787', 'z', '9465', 'X', 'X', '4017', '8305', 'y', '6897', 'y', '6045', '9863', 's', 'd', '3611', 'l', 'd']

Ex Output:
56191


Ex Input:
['7129', 'Q', 'I', 'i', 'U', '3745', '4111', '7633', '7057', '1331', 'n', '8151', 'Q', '4105', '6481', 'x']

Ex Output:

49743