Оборотень

#pragma once
#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <vector>
#include <stdio.h>
#include <cmath>
#include <math.h>
#include <queue>
#include <stack>
#include <climits>
#include <deque>
#include <ctime>
#include <iomanip>
#include <bitset>
#include <unordered_map>
#include <unordered_set>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int ui;

#define mh() make_heap()
#define poph() pop_heap()
#define pushh() push_heap()
#define sor(n) n.begin(), n.end()
#define rsor(n) n.rbegin(), n.rend()
#define mp make_pair
#define files freopen("input.txt", "rt", stdin); freopen("output.txt", "wt", stdout)
#define p(T) pair<T,T>
#define toch(x) cout.precision(x), cout.setf(ios::fixed)
#define znac(l) abs(l)/l
#define IOS ios::sync_with_stdio(false)
#define IOSB cin.tie(0), cout.tie(0);
const ll ok = ll(1e9 + 7);

void dfs(ll v, vector<vector<ll>>&graf, vector<ll>&used)
{
    for (int i = 0; i < graf[v].size(); i++)
    {
        if (!used[graf[v][i]])
        {
            used[graf[v][i]] = 1;
            dfs(graf[v][i], graf, used);
        }
    }
}
int main()
{
    IOSB;
    IOS;
#ifdef TheCompiler
    files;
#endif
    ll n;
    cin >> n;
    vector<vector<ll>>graf1(n + 1);
    vector<vector<ll>>graf2(n + 1);
    string s;
    cin >> s;
    while(s!="BLOOD")
    {
        ll b;
        ll a = atoi(s.c_str());
        cin >> b;
        graf1[a].push_back(b);
        graf2[b].push_back(a);
        cin >> s;
    }
    ll k;
    vector<ll>used(n+1, 0);
    while(cin >> k)
    {
        used[k] = 1;
        dfs(k, graf1, used);
        dfs(k, graf2, used);
    }
    set<ll>ans;
    for (int i = 1; i <= n; i++)
    {
        if (!used[i])
        {
            ans.insert(i);
        }
    }
    if (ans.size() == 0)
    {
        cout << 0;
    }
    else
    for (auto i = ans.begin(); i != ans.end(); i++)
    {
        cout << *i << " ";
    }
    return 0;
}