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]: ['J', 'm', '1255', 'S']
[EX A]: 1255

[EX Q]: ['K', 'O', 'p', '1669', '8647', '3417', 'a', '8903', 'V', 'E', 'l', 'a', '5177', 'J', '6559', '5377', 'X', '9427']
[EX A]: 49176

[EX Q]: ['8449', 'd', '5465', '9693', 'C', '8761']
[EX A]:
32368