Definition: In this task, you're given five sentences, numbered 1 through 5. Your job is to generate a title for the story that makes complete sense. The title must be short, with less than three words, use simple language, and include the main topic of the story.
Input: Sentence 1: Tony walked to class with Krista every morning. Sentence 2: One morning she wasn't there. Sentence 3: He saw her later that day and asked where she'd been. Sentence 4: She told him she had slipped on the ice. Sentence 5: Her pant leg was frozen, so she went back home.

Where's Krista