You will be given a definition of a task first, then some input of the task.
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.

Sentence 1: Mark was an introvert student, and his friends called him library-hog. Sentence 2: He was always offended by this, and tried to curb conversations. Sentence 3: Natalie, his friend started introducing him to more people. Sentence 4: He built confidence while conversing with others. Sentence 5: Mark's friends stopped teasing him, and started treating him nicely.
Output:
From library-hog to contacts.