public static String convertIndexToLetter (int index) {
		String letter;
		switch(index) {
		case 0: 
			letter="A";
			break;
		case 1: 
			letter="B";
			break;
		case 2: 
			letter="C";
			break;
		case 3: 
			letter="D";
			break;
		case 4: 
			letter="E";
			break;
		case 5: 
			letter="F";
			break;
		case 6: 
			letter="G";
			break;
		case 7: 
			letter="H";
			break;
		default:
			letter="";
		}
		return letter;
	}