I'm trying to write down a script that will get the Build Number of a Build that has been triggered by another job. For example: I have a build job that calls two other jobs(Call/trigger builds on other project). When the main job is finished with success I would like to get the number of the first build job that was triggered from within. The script I'm trying to run founds the main job, however I can't get in any way the build number of the triggered job.

def job = jenkins.model.Jenkins.instance.getItem("Hourly")
job.builds.each {
def build = it
if (it.getResult().toString().equals("SUCCESS")) {The rest of the code should go here!}

I was trying to find it in the Jenkins java-doc API and online, however without any luck. Can somebody please help me with that?

P.S. The script runs after the job has finished(triggered when needed only).