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: ['2417', '6671']
Example Output: 9088

Example Input: ['s', 'M', 'U', '5383']
Example Output: 5383

Example Input: ['Z', '1259', '9685', 'P', 'l', '9023', '2347', 'v', '8677', 'X', '3223']
Example Output:
34214