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]: ['251', '2155', '5029', 'k', 'j', 'I']
[A]: 7435


[Q]: ['o', 'a', 'K', '6031']
[A]: 6031


[Q]: ['8165', '219', 'D', 'x', 'n', 'L', 'x', 'n', '1343', 'o', 'T', 'M', 'q', 'D', '9001', 'v', '3599']
[A]:
22327