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: ['2151', '7511']
Example Output: 9662

Example Input: ['I', 'n', '3069', '477', 'F', 'k', '847', '6777', 'N', 'X', 'F', '1417', '9445', 'o', 'v', 'd', '2169', 'w']
Example Output: 24201

Example Input: ['P', 'X', '4991', 'p', 'N', '9097', 'D', 'W', '8149', 'O', '2837']
Example Output:
25074