public int findIndexLetter(char ch)
	{
		if(Character.toLowerCase(ch)=='a')    {return 0;}
		if(Character.toLowerCase(ch)=='b')    {return 1;}
		if(Character.toLowerCase(ch)=='c')    {return 2;}
		if(Character.toLowerCase(ch)=='d')    {return 3;}
		if(Character.toLowerCase(ch)=='e')    {return 4;}
		if(Character.toLowerCase(ch)=='f')    {return 5;}
		if(Character.toLowerCase(ch)=='g')    {return 6;}
		if(Character.toLowerCase(ch)=='h')    {return 7;}
		return -1;
	}