charsToUpper

using System;

namespace charsToString
{
    class Program
    {
        static void Main()
        {
            var one = (Console.ReadLine());
            string upper = "upper-case";
            string lower = "lower-case";
            if (one == one.ToUpper())
            {
                Console.WriteLine($"{upper}");
            }
            else if (one == one.ToLower())
            {
                Console.WriteLine($"{lower}");
            }
        }
    }
}