import java.util.*;
import java.lang.*;
import java.io.*;
 
class Main
{
	public static void main (String[] args)
	{
		Scanner in = new Scanner(System.in);
		String c = in.nextLine();
		String str = "";
        for (int i = 0; i < c.length(); i++) {
            if (c.charAt(i) <= 'z' && c.charAt(i) >= 'a')
                str += Character.toUpperCase(c.charAt(i));
            else
                str += Character.toLowerCase(c.charAt(i));
        }
        System.out.print(str);
	}
}

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