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.
['1923', '1901', '8951', 'z', 'J', '1365', '655', 'A', 'i', 'V', 'z', 'z', '179', 'h', '1917', 'N', 'O', '7275', '7037', 'S']