public class PasswordTester
{
   public static void main(String[] args)
   {
      String originalPassword = "asecretid";

      char string[] = originalPassword.toCharArray();
      int i = 0;
      for(char ch : string)
      {
         switch(ch)
         {
         case 'e':
            string[i] = '3';
            break;
         case 'i':
            string[i] = '1';
            break;
         case 'a':
            string[i] = '@';
            break;
         case 's':
            string[i] = '$';
            break;
         }
         i++;
      }

      String modifiedPassword = new String(string);

      System.out.println(modifiedPassword);

      System.out.println("Expected: @$3cr3t1d");
   }
}