/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		StringBuffer buf = new StringBuffer("123456789");
 
        int start = 3;
        int end = 6;
        buf.replace(start, end, "foobar"); 
        System.out.println(buf);
 
	}
}

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