func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MOD = 1e9 + 7;   const int MOD2 = 1e9 + 9;   const int PR = 727;   const int INF = INT_MAX;   const long long LINF = LLONG_MAX;   const int N = 1e5 + 20;   vector<int> G[N], p;   int n, m, k, f[N], tmp;   bool visited[N];   int main() {     ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);     cin >> n >> m >> k;     for (int i = 0, v, u; i < m; i++) {       cin >> v >> u;       G[v].push_back(u);       G[u].push_back(v);     }     int v = 1;     while (1) {       visited[v] = 1;       f[v] = tmp++;       p.push_back(v);       for (int u : G[v])         if (!visited[u]) v = u;       if (visited[v]) break;     }     int idx = INF;     for (int v : G[p.back()]) idx = min(idx, f[v]);     cout << p.size() - idx << endl;     for (int i = idx; i < p.size(); i++) cout << p[i] <<    ;     cout << endl;   }   