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: ['u', 'i', 'z', 't', '9617', 'd', '3255', 'w', 'S', '3041', '7451']
Example Output: 23364

Example Input: ['1319', '6105', '1119', 'c', 'p', '7617', '5113', 'a', '5115', '6731', '6693']
Example Output: 39812

Example Input: ['3205', 'Y', '4113', 'm', '5083', 's', 'e', '7151', '3589', 'P', '4671']
Example Output:
27812