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.
--------
Question: ['5499', '39', 'Q', 'b', 'W', '7155', '2515']

Answer: 15208


Question: ['v', 't', 'a', 'r', 'O', 'I']

Answer: 0


Question: ['4815', 'L', 'y', '4069', 'U', 'j', '8811', 'B', '6185', '9403', '4183', '433', '3381', 'G', '1055']

Answer:
42335