import java.awt.*;
import java.io.*;

// the program demonstrates various methods 
// of class String and StringBuffer

public class StringQuestion {

    public static void main (String [] args) {
	StringBuffer sb1 = new StringBuffer("Giraffes");
	StringBuffer sb2 = new StringBuffer("Elephants");
	String st1 = new String(" are huge");
	sb1.append(st1);
	int i = sb1.indexOf("huge");
	sb1.replace(i, i+4, "tall");
	i = st1.indexOf("huge");
	st1 = st1.substring(0, i);
	String st2 = st1.concat("grey");
	sb2.append(st1);
	st1 = new String("strong");
	sb2.append(st1);

	// write a part of a program to change the sentences to:
	// "Giraffes are very tall"
	// "Elephants are very strong"

	System.out.println(st1);
	System.out.println(st2);
	System.out.println(sb1);
	System.out.println(sb2);
    }
}