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: ['X', 'u', 'B', '269', '9089', 'M', '5175', 'K']
Example Output: 14533

Example Input: ['M', '9933', '9861', 'f', 'N', 'R', '7625', 'p', 'T']
Example Output: 27419

Example Input: ['2975', 'w', 'p', '8281', '6399', '6735', '8491', 'K', '4529']
Example Output:
37410