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.

[EX Q]: ['6563', 'R', 'M', 'B', 'b', 'E', '9911', '7327', 'J', '7389', 'w', 'b', 'c', '1527', 'K', 'r', '5441', '6823', '8455']
[EX A]: 53436

[EX Q]: ['k', 'Z', 'r', 'K', 'b', 'X', 'A']
[EX A]: 0

[EX Q]: ['7755', 'Z', 'b', 'X', '1073', '9813', '1519', 'x', 'H']
[EX A]:
20160