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.

['q', 'N', 'y', '7859', 'u', '2861', '4151', 'Q', 'x']
14871

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

['W', '6415', '6805', 'N', 'C', '6321', 'h', '6483', 'z', 'w']

26024