/* 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 final int NUMBER_OF_LETTERS_IN_ALPHABET = 'z'-'a'+1;
    public final int LETTER_VALUE = 'a';
 
     public String encode(String message, int key) {
         key %= NUMBER_OF_LETTERS_IN_ALPHABET;
 
         StringBuilder result = new StringBuilder(message);
 
         for (int i = 0; i < message.length(); i++) {
         	 char c = message.charAt(i);
         	 if (c >= LETTER_VALUE && c < LETTER_VALUE + NUMBER_OF_LETTERS_IN_ALPHABET) {
         	   c = (char)((message.charAt(i) - LETTER_VALUE + key) % NUMBER_OF_LETTERS_IN_ALPHABET + LETTER_VALUE);
               result.setCharAt(i, c);
         	 }
         }
 
         return result.toString();
     }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner sc = new Scanner(System.in);
		String input = sc.nextLine();
		String encoded = new Ideone().encode(input, 3);
		System.out.println("Encoded: ["+encoded+"]");
	}
}

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dG8gamVzdCB0ZXN0

to jest test