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]: ['E', 'y']
[A]: 0


[Q]: ['4529', '7465', 'S', 'Z', 'v', 'w', '5791', '3363', '2643']
[A]: 23791


[Q]: ['8723', 'z', 'z', 'H', '6841', 'I', 'u']
[A]:
15564