using System;
using System.Collections.Generic;
using System.Text;
class Program
{
    static void Main()
    {
        var line = Console.ReadLine().ToCharArray();
        foreach(var s in line)
        {
            int num = (int)s;
            if(num > 90)
            {
                Console.Write((char)(num - 32));
            }
            else
            {
                Console.Write((char)(num + 32));
            }
        }        
    }
}