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]: ['s', '425', '6135']
[A]: 6560


[Q]: ['8669', '9115', '2573', '9261']
[A]: 29618


[Q]: ['n', '1257', 'x', '6069', 'o', '1877']
[A]:
9203