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]: ['M', '9387', '7125', 'c', '1295', 'X', 'l', '9867']
[A]: 27674


[Q]: ['Y', '9053', 'N', '6921']
[A]: 15974


[Q]: ['7337', '8851', '815', 'T', 'm', '2235', 'y', 'X', '7525', 'Z', 'K', '5175', 'T', '3381']
[A]:
35319