class ExpA1 {
    public static void main(String[] arg) {
    	if (arg.length >= 1) {
            System.out.println((arg[0]));
        } else {
            System.out.println("ERROR in line 4");
            System.exit(-1);
        }
        if (!out(arg, 1)) {
            System.out.println("ERROR in line 9");
            System.exit(-1);
        }
        if (!out(arg, 2)) {
            System.out.println("ERROR in line 13");
            System.exit(-1);
        }
    }
    static boolean out(String[] arg, int i) {
    	if (arg.length >= i + 1) {
            System.out.println(arg[i]);
            return true;
        } else {
            System.out.println("ERROR in line 20");
            return false;
        }
    }
}