#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
struct VectorHash {
  size_t operator()(const std::vector<int> &v) const {
    std::hash<int> hasher;
    size_t seed = 0;
    for (int i : v) {
      seed ^= hasher(i) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
    }
    return seed;
  }
};
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
vector<long long int> adj[101];
bool visited[101];
void dfs(long long int node) {
  visited[node] = 1;
  for (auto i : adj[node]) {
    if (!visited[i]) dfs(i);
  }
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long int n, m, u, v;
  cin >> n >> m;
  long long int c = 0;
  for (int i = 0; i < m; i++) {
    cin >> u >> v;
    adj[u].push_back(v);
    adj[v].push_back(u);
  }
  for (int i = 1; i <= n; i++) {
    if (!visited[i]) {
      c++;
      dfs(i);
    }
  }
  if (c == 1 and n == m)
    cout << "FHTAGN!" << '\n';
  else
    cout << "NO" << '\n';
}
