What is the solution of ugly duckling?

In the story of "The Ugly Ducking" by Hans Christian Andersen, the solution is that the ugly duckling grows into a beautiful swan. At first, the duckling is rejected by the other ducks in the pond because of his appearance, but he eventually finds his true identity and is accepted into the swan community. This is a symbolic representation of personal transformation, self-acceptance, and finding one's true self in the face of adversity and difference.