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:
['773', 'e', '4451', 'S', 'I', 'r', 'e', 'V', 'Q', 'g', 'J', 'L', '7655', 'O']

Ex Output:
12879


Ex Input:
['k', '6555', 'L', '7549', 'W', 'y', 'y', '8817', 'J', 't', 'X', 'M', 'N', 'G', '7441', '283']

Ex Output:
30645


Ex Input:
['1271', 'k', '2493', '1961', 'Z', 'n', 'M']

Ex Output:

5725