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]: ['h', '2335', '2669', '6035', '9901', '7721', 's', '6181', 'C', 'l', 'x', '8275', '1103', 'S', '6447']
[A]: 50667


[Q]: ['P', '6161', 'k', '5925', 'h', 'G', 'n']
[A]: 12086


[Q]: ['6093', 'I']
[A]:
6093