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: ['2895', '8095', 'y', '1927', '4827']
Example Output: 17744

Example Input: ['7411', 'Y', 'x', 'l', '4119', '7241']
Example Output: 18771

Example Input: ['y', 'd', '3109', '87', '6231']
Example Output:
9427