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: ['1845', '273', '6921', 'u', '165', 'n', 'y', 'I', 'u', 'X', '5503', 'L', 'G', 'V', '6223', '1123', 'v']
Example Output: 22053

Example Input: ['f', 'N', '8597', 't', 'K', '9755', 'j', '9747', '7259', '5493', 'n', '7269', '8493', '2279', '5369', 'f']
Example Output: 64261

Example Input: ['V', '7281', 'V', 'L', 'C', '4359', 'O', 'O', '3133', 'A', 'Q', '5921']
Example Output:
20694