using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string a = Console.ReadLine();

        for (int i = 0, i < a.Length; i++)

        {

            for (int j = i+1; j< a.Length; j++)

            {

                if (a[i]==a[j])

                {

                    Console.WriteLine("There are repeating letters.");

                    return;

                }

            }

        }

        Console.WriteLine("All letters are unique.");

    }

}