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.

['4425', 'x', '1959', 'C', 'c', 'D', 'M', '8317', 'q', 'x', '4277', 'N', 'z', 'I', '1921', 'o', 't']
20899

['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']
50667

['V', '1743', 'r', '6513', '7631', '3011', '4579', 'r', 'i', '4399', '1491', 'm', 'f', 't', 'm', '5493', 't', '4385', 'N']

39245