add Puzzle A variants

Assets/Desert/Runtime/Puzzle A/Symbol.cs

@@ -30,7 +30,7 @@ namespace EscapeRoomEngine.Desert.Runtime.Puzzle_A
     [RequireComponent(typeof(Emission))]
     public class Symbol : MonoBehaviour
     {
-        public int symbolNumber;
+        public int symbolNumber, symbolPosition;
         public float anglePosition;
         public event SymbolEventHandler SymbolEvent;