/* http://es.stackoverflow.com/q/27243/127 */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
 
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String[] palabras = {"pan","pan2"};
		String[] valores = {"pan1","pan2"};
		String oracion = "el pan es mejor que el pan2";
 
		//REEMPLAZAR PALABRAS POR VALORES
		for (int i = 0; i < 2; i++) {
		    oracion = oracion.replaceAll("\\b"+Pattern.quote(palabras[i])+"\\b",valores[i]);  
		}
 
		System.out.println(oracion);
	}
}

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