/**
 * Created by DARK WRATH on 08-02-2017.
 */
import java.util.*;
public class AltLowerCase
{
    public static void main(String args[])
    {
        Scanner s=new Scanner(System.in);
        System.out.println("Enter the sentence");
        String se1=s.nextLine();
        String se2=se1.replaceAll("['QWERTYUIOPASDFGHJKLZXCVBNM']", "['qwertyuiopasdfghjklzxcvbnm']");
        System.out.print(se2);
    }
}
// this will result logical error. So better avoid. //
// however its not the logic. just trying a different approach. //
//one should always go for String.toLowercase() //