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: ['w', '7301', '9411', 'z', 'g', 'X', '1045', 'l', 'F', 'M', 'R', '7957', 'e', '5145']
Example Output: 30859

Example Input: ['6217', 'A', '1925', 'o', '1433']
Example Output: 9575

Example Input: ['4655', 'i', '6607', 'l', 'N', 'F', 'S', 'k', 'k', '4063', 'Z']
Example Output:
15325