#include <bits/stdc++.h>
using namespace std;
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1LL)
using ll = long long;
const int mxn = 9 + 1e6;
const int inf = 0x3f3f3f3f;
const ll lnf = 0x3f3f3f3f3f3f3f3f;
int n, m;
vector<vector<int>> adj;
vector<array<int, 2>> e;
namespace SUB1 {
bool check() {
return (n <= 10 && m <= 45);
}
vector<int> par;
vector<char> used;
void dfs(int u, int s, int h) {
if (h >= 4) {
vector<int> res;
int cur = u;
while (cur != 0) {
res.push_back(cur);
cur = par[cur];
}
reverse(res.begin(), res.end());
if (binary_search(adj[res.back()].begin(), adj[res.back()].end(), res.front())) {
int k = (int)res.size();
bool f = false;
for (int i = 0; i < k && !f; ++i) {
for (int j = i + 1; j < k; ++j) {
if (j == i + 1) continue;
if (i == 0 && j == k - 1) continue;
if (binary_search(adj[res[i]].begin(), adj[res[i]].end(), res[j])) {
f = true;
break;
}
}
}
if (!f) {
for (int v : res) cout << v << " ";
cout << "\n";
exit(0);
}
}
}
used[u] = 1;
for (int v : adj[u]) {
if (!used[v]) {
par[v] = u;
dfs(v, s, h + 1);
}
}
used[u] = 0;
}
void solve() {
par.assign(n + 1, 0);
used.assign(n + 1, 0);
for (int i = 1; i <= n; ++i) sort(adj[i].begin(), adj[i].end());
for (int i = 1; i <= n; ++i) {
par[i] = 0;
dfs(i, i, 1);
}
cout << "no\n";
}
}
namespace SUBFULL {
void solve() {
vector<vector<bool>> check(n + 1, vector<bool>(n + 1));
for (int i = 1; i <= n; ++i) {
for (auto &j : adj[i]) {
check[i][j] = true;
}
}
vector<int> dist(n + 1), par(n + 1);
deque<int> q;
sort(begin(e), end(e));
e.resize(unique(begin(e), end(e)) - begin(e));
for (auto &x : e) {
fill(begin(dist), end(dist), -1);
fill(begin(par), end(par), -1);
while (!q.empty()) {
q.pop_back();
}
dist[x[0]] = 0;
q.push_back(x[0]);
bool f = false;
while (!q.empty()) {
int u = q.front();
q.pop_front();
for (auto &v : adj[u]) {
if ((u == x[0] && v == x[1]) || (u == x[1] && v == x[0])) {
continue;
}
if (!~dist[v]) {
dist[v] = dist[u] + 1;
par[v] = u;
if (v == x[1]) {
f = true;
break;
}
q.push_back(v);
}
}
if (f) {
break;
}
}
if (f) {
int len = dist[x[1]];
if (len >= 3) {
int s = x[1];
vector<int> res;
while (~s) {
res.push_back(s);
s = par[s];
}
reverse(begin(res), end(res));
bool f = false;
for (int i = 0; i < (int) (res.size()) && !f; ++i) {
for (int j = i + 1; j < (int) (res.size()); ++j) {
if ((i == 0 && j == (int) (res.size()) - 1) || (j == i + 1)) {
continue;
}
if (check[res[i]][res[j]]) {
f = true;
break;
}
}
}
if (!f) {
for (auto &x : res) {
cout << x << " ";
}
return;
}
}
}
}
cout << "no\n";
}
}
void _27augain(void) {
cin >> n >> m;
adj.resize(n + 1);
for (int i = 0; i < m; ++i) {
int u, v;
cin >> u >> v;
adj[u].push_back(v);
adj[v].push_back(u);
e.push_back({u, v});
}
SUB1::solve();
}
int32_t main(void) {
#define task "27augain"
cin.tie(0)->sync_with_stdio(0);
for (string iext : {"in", "inp"}) {
if (fopen((task "." + iext).c_str(), "r")) {
freopen((task "." + iext).c_str(), "r", stdin);
freopen(task ".out", "w", stdout);
}
}
int testcase = 1;
// cin >> testcase;
while (testcase--) {
_27augain();
}
return 0;
}
