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]: ['c', '4501', 'O']
[A]: 4501


[Q]: ['6367', '9923', '9141']
[A]: 25431


[Q]: ['A', '4175', 'V', '6669', '9059', 'I', '5631', '721', 'm', '5271']
[A]:
31526