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]: ['G', 'Z', '4819', '9763', '9987']
[A]: 24569


[Q]: ['6731', 'f', '4561', '5601', 'i']
[A]: 16893


[Q]: ['2149', '7185', 'Z', 'M', 'U', '4553', 'X', '9671']
[A]:
23558