using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static string InputPattern = "Input4";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("CapsLock");
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("ABCdef");
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("A");
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();

        Func<char, char> ConvCaseFunc = pChar =>
        {
            if ('a' <= pChar && pChar <= 'z')
                return (char)('A' + pChar - 'a');
            return (char)('a' + pChar - 'A');
        };

        foreach (char EachChar in InputList[0]) {
            Console.Write(ConvCaseFunc(EachChar));
        }
        Console.Write(Environment.NewLine);
    }
}