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]: ['D', '7807', '9395', 'T', 'c', '5139', '2827', 't', 'T', 'm', '3717', 'U', '3225', '7419', '2481', 'p', 'C', '5277']
[A]: 47287


[Q]: ['D', 'R', 'Y', '4929', 'P', '7929']
[A]: 12858


[Q]: ['4633', 'r', 'l', '8991', 'T', '8585', '5621', 'o']
[A]:
27830