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: ['A', '771', 'Q', 'b', '9929', '4991', 'q', '9863', '4363', '5721', 'C', '991', 'j', 'r', 'Q', 'B', 'K']
Example Output: 36629

Example Input: ['3451', '2325', '2511', 'i', '6159', '2291', 'e', 'l', 'P', '1177', 'o', 'T']
Example Output: 17914

Example Input: ['h', 'p', 'z', 'M', '6067', 's', 'h', 'c', '2419', 'B', '7227', '8059', 'h', 'K', 'j', '2751', 'J', '4351']
Example Output:
30874