```json
{
  "TragedyDegree": 3,
  "ComedyDegree": 5
}
```

Explanation:
- **Tragedy Degree: 3**: The story has some elements of melancholy, particularly Marissa feeling a lump in her throat and the mix of pride and sadness during her final lecture. However, there are no significant tragic events or profound emotional impacts that would warrant a higher tragedy score.
- **Comedy Degree: 5**: The story has a generally positive and uplifting tone, especially with Marissa's excitement for retirement and her plans for the future. It’s light-hearted and ends on a hopeful note, but it doesn’t include strong comedic elements or an extremely happy/comedic ending, so it scores moderately here.
