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: ['6055', 'v', '9455', 'A', '6817', 'D', '9339', 't', 'K', '1993']
Example Output: 33659

Example Input: ['4463', '489']
Example Output: 4952

Example Input: ['5761', '1817', 'N', '6325', '2211', 'j', '4001', '1467', 'e', '953', 'T', '9159', '2079']
Example Output:
33773