public Pos convert(char c){
		
		switch(c){
		case 'R':
			return Pos.ROBOT;
		case 'L':
			return Pos.LIFT_C;
		case 'O':
			return Pos.LIFT_O;
		case '.':
			return Pos.EARTH;
		case '#':
			return Pos.WALL;
		case 'x':
			return Pos.DIAMOND;
		case ' ':
			return Pos.EMPTY;
		case '*':
			return Pos.ROCK;
		default:
			return null;
		}
		
	}