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: ['v', '9511', 'f', 'q']
Example Output: 9511

Example Input: ['D', 'C', '7295', 'g', 'j', '1387', 'O', '4701', 'B', 'd', 'W', 'b', 's', 'n', 'n', '4917', '2941', '1825', 'x']
Example Output: 23066

Example Input: ['415', 'I', 'u', 'V']
Example Output:
415