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]: ['E', 'v', 'l', 'c', 'g', '3929', 'q', 'j']
[A]: 3929


[Q]: ['s', 'K', '5205', 'j', '3247', '7219', '529', '7257', '6069', '5265', 'a', '4919', '249']
[A]:
39959