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]: ['d', '5571', '6455', '4287', 'I', 'U', 'M', '8303', '8893']
[A]: 33509


[Q]: ['d', '4553']
[A]: 4553


[Q]: ['j', '9247', '5975', 'C', '3979', 'u', 'H', '4191', 'm']
[A]:
23392