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:
['4749', '1169', '4273', 'X']

Ex Output:
10191


Ex Input:
['3557', '3345', '307', '9791', '1897', 'O']

Ex Output:
18897


Ex Input:
['1335', 'k', 'Y', 'q', '1451', 'f', '8995', '2087', '2869', 'E', '6527', 'F', '6565']

Ex Output:

29829