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: ['2577', 'B', '3059', 'S', 'l', 'T', 'Q', 'x', 'f', 'l', 'y']
Example Output: 5636

Example Input: ['95', '279', 'y', 'p', '5083', 'X', 'E', '3817']
Example Output: 9274

Example Input: ['r', '263', '5949', 'e', 'h', '8567', '339', 'A', 'j', 'I', 'J', '9467']
Example Output:
24585