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: ['t', 'Q', '5189', 'g', 'c', '4685', '5309', 'W', '6729', '2843']
Example Output: 24755

Example Input: ['o', 'O', 'H', '7619', '6435', 'X', 'g', '1663']
Example Output: 15717

Example Input: ['3325', '6661', '2045', 't', '5117', 'V', '309', 'a', 'd', '2913', '9371', 'j', 's', 'a', 'z', '7357', '5315', '5763']
Example Output:
48176