public int converterS(String l) {
	if (l.equals("a")) {
	    return 0;
	}
	else if (l.equals("b")) {
	    return 1;
	}
	else if (l.equals("c")) {
	    return 2;
	}
	else if (l.equals("d")) {
	    return 3;
	}
	else if (l.equals("e")) {
	    return 4;
	}
	else if (l.equals("f")) {
	    return 5;
	}
	else if (l.equals("g")) {
	    return 6;
	}	
	else if (l.equals("h")) {
	    return 7;
	}	
	else if (l.equals("i")) {
	    return 8;
	}
	else {
	    return -1;
	}
    }