Definition: In this task, you're given five sentences, numbered 1 through 5, and two options a and b for possible titles for the story. Your job is to choose the title that better fits the story. Indicate your choice by 'a' or 'b'.
Input: Sentence 1: I was walking in the park when i saw a dog. Sentence 2: The dog seems tired and hungry so i gave him water and food. Sentence 3: It seems that he is lost so i took him and find its owner. Sentence 4: Until i saw a kid crying and i go near him. Sentence 5: When he saw he smiled because i'm with his lost pet. Choices: a. ISS. b. lost pet.

b