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: ['b', 's', 'v', '4757', '9063', 'I', '8397', '7975', 'Q']
Example Output: 30192

Example Input: ['d', '7305', '8903', 'b', '7687', '6393', '6939']
Example Output: 37227

Example Input: ['c', 'p', '7803', '4323']
Example Output:
12126