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]: ['9787', '1491', '4411', '5261', 'U', '9787', 'b']
[A]: 30737


[Q]: ['3215', 'T', '605', '3641', 'c', '7561', 'S', '8169', '9723', '2513', 'V', '1477', '1695', '4055', 'W', 'V', '6779']
[A]:
49433