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: ['2013', 'S', 's', '9353', 'b', 'u', '6687', '5429', '3545', '7269']
Example Output: 34296

Example Input: ['2469', 'c', '6931', 'a', '2167', '9493', '9403', '4123', '4949', 'R', 'V', 'h', '315', 'T', '9411', 'M', '1329', '8217', '6105', 'Y']
Example Output: 64912

Example Input: ['d', 'i', 'P', '6453', '8065', 'Z', 'Y', 'N', 'z', 'I', '2215', 't', 'R', '6199']
Example Output:
22932