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:
['4463', '489']

Ex Output:
4952

Ex Input:
['N', 'O', '2635', '8891']

Ex Output:
11526

Ex Input:
['G', 'j', 'G', 'I', 'D', 'e', 'M', '4251', 'p']

Ex Output:
4251