// UUID: 07d1ac42-a158-4ea2-b380-1316a160808a
#include <bits/stdc++.h>
#include <queue>
using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;cin >> n >> m;
    vector<vector<int>> g(n+1);
    vector<int> c(n+1, 0);
    for(int i = 0; i < m; i++)
    {
        int a,b;cin >> a >> b;
        c[b]++;
        g[a].push_back(b);
    }
    queue<int> q;
    vector<int> ans;
    for(int i = 1; i <= n; i++) if(c[i] == 0) q.push(i); 
    while(!q.empty())
    {
        int v = q.front();
        ans.push_back(v);
        q.pop();
       
        for(int e: g[v])
        {
            c[e]--;
            if(c[e] == 0) q.push(e);
        }
    }
    if(ans.size() < n)
    {
        cout << "0";
        return 0;
    }
    vector<int>ans2 = ans;
    for(int i = 0; i < n-1; i++)
    {
        int a = ans[i];int b = ans[i+1];
        bool connected = false;
        for(int e: g[a])
        {
            if(e == b) connected = true;
        }
        if(!connected)
        {
            swap(ans2[i], ans2[i+1]);
            cout << "2\n";
            for(int v: ans) cout << v << " ";
            cout << "\n";
            for(int v: ans2) cout << v << " ";
            return 0;
        }         
    }
    cout << "1\n";
    for(int a: ans) cout << a << " ";
}

/*


beolvasasás
befokok számolása

sor létrehozása
források a sorba

queue <int> q;
vector <int> ans;

while (q.size()>0){
    
    int x = q.front();
    q.pop();

    for (int y : g[x]) {
        y befokát csökkentem
        ha 0-ra csökkent, akkor beteszem a sorba
    }

}

ans mérete alapján eldöntöm

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Létezik-e több?


*/