One warm day Antek and Lena were playing in the Hundred Acre Wood. They were collecting colourful leaves, singing songs to the birds and watching the squirrels jumping in the trees. Suddenly, Antek noticed something shining under a large leaf. He bent down and picked up a small golden key. "Look, Lena! Where did the key come from? Maybe it leads to a treasure?" - he exclaimed excitedly. Lena took a closer look at the key. It was decorated with a small heart and had mysterious stamps engraved on it. "Maybe it opens the door to a hidden fairy house? Or a chest full of sweets!" - she suggested with a broad smile. The children decided to find the lock that matched the key. They walked carefully between the trees, looking around carefully. Suddenly, a quiet rustling sound came from behind a tall bush. Something had moved there! The children stopped motionless, clutching the key tightly in their hands. Who or what was hiding behind the bush?