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: ['K', '9121', 'y', '4233', '1513', 'd', '5609', 'C', 'q', 'p', 'S', '627', 'q', 'I']
Example Output: 21103

Example Input: ['6577', 'Q', '6865', '7671', 'N']
Example Output: 21113

Example Input: ['A', 'm', 'Z', '1989', '469', 'U', 't', 'h', '8921', '9177', 'j', '6679', 'E']
Example Output:
27235