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.

Input: Consider Input: ['S', 'D', '3101', '4967', '8197', '5025', '4257', 'S', 'X', '7641', 'n', '6775', '4719', 'o', '2821', 'x', '5605', '2181']

Output: 55289

Input: Consider Input: ['6731', 'f', '4561', '5601', 'i']

Output: 16893

Input: Consider Input: ['8789', '2719', '8731', '4835', 'Y', 'W', '2449', 'x', 'M', 'N', 'o', '8549', '2003', '4083', '3467', '6049']
Output: 51674