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

['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']
23791

['9573', 's', 'x', '5705', 'b', '7131', '7489', '699', '2363', 'T', 'W', 'X', '3797', 'g', '9345', 'n', 'l']

46102