using System;
using System.Linq;

namespace No163
{
    class Program
    {
        static void Main(string[] args)
        {
            var S = Console.ReadLine();
            var result = new string(S.Select(s => (char)((int)s > 96 ? (int)s - 32 : (int)s + 32)).ToArray());
            Console.WriteLine(result);
        }
    }
}