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: ['597', 'i', 'd', '3201', 'u', '1111', '8563', 'c', 'E', '5983', '6293']
Example Output: 25748

Example Input: ['6321', 'M', 'd', '3673']
Example Output: 9994

Example Input: ['1829', 'f', 'y', '7419', 'q', '5005', '7563', '6469', '9679', 'D', 'f', 'G', '7147', 'j', '5979', 'k', 'q', 'C', '8135', '1263']
Example Output:
60488