In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.

Input: Consider Input: Sentence1: Tina was taking a science test. Sentence2: She was not prepared. Sentence3: She hardly studied. Sentence4: She kept it blank. Sentence5: She ended up failing.

Output: Tina

Input: Consider Input: Sentence1: Tommy wanted to fix the scratches on his car. Sentence2: The scratches came from a curb he missed last week. Sentence3: He bought some car paint from his local auto store. Sentence4: He spent a weekend covering the scratches on his car. Sentence5: Tommy's car looks brand new now.

Output: Tommy

Input: Consider Input: Sentence1: On Saturday I went on my friend's boat. Sentence2: We spent the day swimming and playing in the sunshine. Sentence3: We stayed on the lake until after the sun went down. Sentence4: Once it was dark, we watched fireworks. Sentence5: It was a perfect summer day!
Output: I (myself)