import javax.swing.*;

class BuildString 
{

    public static void main(String[] args)
    {
        
        StringBuffer myStr;

      // start with the empty string

        myStr = new StringBuffer("");

        System.out.println("So far the string is: " + myStr);

        myStr.append("Four and seven years ago ago");
        System.out.println("So far the string is: " + myStr);
        
        myStr.insert(4," score");
        System.out.println("So far the string is: " + myStr);

        int index;
        index = myStr.indexOf("ago");
        myStr.delete(index,index+4);
        System.out.println("So far the string is: " + myStr);
        
       System.exit(0);

    }
}