//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//  MMMMMMMMMMMMMMMMNOtXtdMMMMMNxzZMMNmgHyVVVVVW%..?/(.,(x-..........(HfffpffpffpffWHHffpffppfVyyWMMMMMM


//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

constexpr int MAX_V = 5050;

vector<int> G[MAX_V];

int main() {

    int n, m;
    cin >> n >> m;

    vector<int> in(n, 0);

    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        a--, b--;
        G[a].push_back(b);
        in[b]++;
    }

    queue<int> Q;
    for (int i = 0; i < n; i++) if (in[i] == 0)Q.push(i);

    bool multi = false;

    vector<int> ans;
    while (!Q.empty()) {
        int v = Q.front();
        Q.pop();
        if (Q.size() > 0) multi = true;
        ans.push_back(v);
        for (int i = 0; i < G[v].size(); i++) {
            int to = G[v][i];
            in[to]--;
            if (in[to] == 0) {
                Q.push(to);
            }
        }
    }

    for (int i = 0; i < n; i++) cout << ans[i] + 1 << endl;
    cout << multi << endl;

    return 0;
}






































Measured memory_bytes: 3788