import java.util.Scanner;

public class SwapStrings
{
    public static void main(String[] args)
    {
       Scanner input = new Scanner(System.in);
       
       String s1, s2;

       System.out.print("Enter s1 = ");
       s1 = input.next();
       System.out.print("Enter s2 = ");
       s2 = input.next();
       
       if ( s1.compareTo(s2) > 0 )
       {
           String help;
           help = s1;
           s1 = s2;
           s2 = help;
       }
       
       System.out.print(s1 + ", " + s2);
    }
}