static void krypt(){
        String zdanie = "ala ma kota"
        boolean b = false;
        System.out.println("Twoj kod to: ");
        for (int a = 0; a < zdanie.length(); a++){
            b = false;
            for (int i = 0; i < book.length; i++){
                for (int j = 0; j < book.length; j++){
                    if(zdanie.charAt(a) == book[i][j] && b == false){
                        System.out.print("( " + i + " , " + j + " ), ");
                        b = true;
         }
         }
        }
        }
       System.out.println();
    }