#include <bits/stdc++.h>
using namespace std;
const int inf = (int)1e9;
const int mod = inf + 7;
const double eps = 1e-9;
const double pi = acos(-1.0);
int n, m, k;
vector<int> g[100100], t;
int used[100100];
set<int> second[100100];
void dfs(int v) {
  used[v] = 1;
  t.push_back(v);
  bool was = 0;
  for (int i = 0; i < g[v].size(); ++i) {
    int to = g[v][i];
    if (!used[to]) {
      was = 1;
      dfs(to);
    }
  }
  if (!was) {
    int pos = 0;
    for (int i = 0; i < t.size(); ++i) {
      if (second[t[i]].find(v) != second[t[i]].end()) {
        pos = i;
        break;
      }
    }
    cout << t.size() - pos << endl;
    for (int i = pos; i < t.size(); ++i) {
      cout << t[i] << " ";
    }
    exit(0);
  }
}
int main() {
  ios_base::sync_with_stdio(0), cin.tie(0);
  cin >> n >> m >> k;
  for (int i = 0, u, v; i < m; ++i) {
    cin >> u >> v;
    second[u].insert(v);
    second[v].insert(u);
    g[u].push_back(v);
    g[v].push_back(u);
  }
  dfs(1);
}
