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.

Example Input: ['9445', '7291', 'r', 'g', '1175', '7823', '5507', 'j', '7249', '6335', '3853', 'b', 'u', 'S', '365', 'Z', '7489', 'S', 'W', 'e']
Example Output: 56532

Example Input: ['G', 'Z', '4819', '9763', '9987']
Example Output: 24569

Example Input: ['G', '5027', 'B', 'Q', 'x', 'D', '7719', 'j']
Example Output:
12746