Teacher: This task is about identifying the subject of a given sentence. The subject of a sentence is the person, place, or thing that is performing the action of the sentence. The subject represents what or whom the sentence is about. Each sentence in this task is guaranteed to contain a single subject. The input is a sentence and the output is the identified subject of that sentence.
Teacher: Now, understand the problem? If you are still confused, see the following example:
The nickname of the  team of University of Nebraska at Omaha is mavericks.
Solution: University of Nebraska
Reason: This is a good example since the subject of the sentence (University of Nebraska) is correctly identified.

Now, solve this instance: 83646315 is the LCCN number for Acta Mathematica Hungarica.
Student:
Acta Mathematica Hungarica