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: ['J', 'm', '1255', 'S']
Example Output: 1255

Example Input: ['P', '3187', 'n', 'W', '247', '8159', '6217', '1807', '7747', 's', 'q', 'E', '8477', 'C']
Example Output:
35841