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]: ['2787', 'z', '9351', '3339']
[A]: 15477


[Q]: ['N', 'V', 't', 'X', 't', 'M']
[A]: 0


[Q]: ['8519', 'v', 'H', 'M', '1399', '4767', 'M']
[A]:
14685