Thread: Vowels

this is my code and the str thingy cannot find could anyone help me thank you! and this the error

import java.util.Scanner;
public class Upper 
{
public static void main(String[] args) 
{
java.util.Scanner scn= new java.util.Scanner(System.in);
System.out.print("Enter Words: ");
           String s1=scn.next();
           System.out.println("original string = " + str);
           System.out.println("After replacing all vowels into capital case = " +
                                      str.replaceAll("a", "A").replaceAll("e", "E")
                                      .replaceAll("i", "I").replaceAll("o", "O")
                                      .replaceAll("u", "U"));
    }

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The compiler can not find the definition for the variable: str. Make sure the code defines str before using it.
The String variable s1 is defined but not used.
Perhaps one of those should be changed to the other.