Scanner in = new Scanner(System.in);
		List cadeira = new List();
		List cursar = new List();
		String leitor = "";
		String quero = "";
		int cont = 0;
		int c = Integer.parseInt(in.nextLine());
		for (int i = 0; i < c; i++) {
			leitor = in.nextLine();
			cadeira.inserir(leitor);
		}
		System.out.println(cadeira.cont(0));
		while (in.hasNext()) {
			quero = in.nextLine();
			cont++;
		}
		String dej []= new String[cont];
		for (int i = 0; i < cont; i++) {
			if (cadeira.getDisci() == cursar.getDisci()) {

			}
		}
	}
}

class List {
	private String disci;
	private String req;
	private List next;

	public List() {
		this.disci = null;
		this.next = null;
	}

	public String getDisci() {
		return this.disci;
	}

	public void setDisci(String disci) {
		this.disci = disci;
	}

	public void inserir(String disci) {
		if (this.disci == null) {
			this.disci = disci;
			this.next = new List();
		} else {
			this.next.inserir(disci);
		}
	}

	public void verificar(String req) {
		if (req.equals(this.disci)) {
			this.req = disci;
			this.next = new List();
		} else if (this.req != null) {
			this.next.verificar(req);
		}
	}

	public int cont(int cont) {
		if (this.disci != null) {
			cont = this.next.cont(cont + 1);
		}
		return cont;
	}

	public boolean x(String disci) {
		if (this.disci.equals(disci) && this.disci != null) {
			return true;
		} else if (!(this.disci.equals(disci)) && this.disci != null) {
			return this.next.x(disci);
		}
		return false;