import java.util.*;
class  BuilderDemo{
    public static void main(String[] args) 
    {
    String st="Java is an OO";
    String str[]=st.split("");
    String reversedSt="";
    for(int i=str.length-1;i>=0;i--){
    reversedSt+=str[i];
    }
    StringBuilder builder=new StringBuilder(reversedSt);
    builder.insert(0, "language ").insert(15,"not ");
    System.out.println(builder.toString());
    }
}

import java.util.*;
class  BuilderDemo{
    public static void main(String[] args) 
    {
    String st="Todays Date is =";
    StringBuilder builder=new StringBuilder(st);
    String str="7/3/2011";
    builder.insert(16, str);
    System.out.println(builder.toString());
    }
}