public Coord(char file, char rank)
	{
		try{

			if(Character.isUpperCase(file)) _file = file - 'A';
			else if(Character.isLowerCase(file)) _file = file - 'a';
			else throw new WrongInputException("file wrong", file, rank);
			if(Character.isDigit(rank)) _rank = rank - '1';
			else throw new WrongInputException("rank wrong", file, rank);
			
			if(_file < 0 || _file > 7) throw new OutOfBoardException("file out", _file, _rank);
			if(_rank < 0 || _rank > 7) throw new OutOfBoardException("rank out", _file, _rank);  

		}catch(WrongInputException e){
			System.out.println(e.getMessage());
		}catch(OutOfBoardException e){
			System.out.println(e.getMessage());
		}
	}