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:
['t', '7469', 'Y', 'N', '8137']

Ex Output:
15606


Ex Input:
['E', '9289', 'j', '1847', 'u', 'w', 'z', '4045', '9567', '3133', '2967', 'I', '1927', 'I', 'f', 'T']

Ex Output:
32775


Ex Input:
['2901', 'T', 'Z', '8335', 'E', '7885', 'Y', 'O', 'I', '4377', 'H', 'U', '8667', 'K', 's', 'X', '6587', 'F']

Ex Output:

38752