#include <cassert>
#include <cmath>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iostream>
#include <limits>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

using Int = long long;

template <class T1, class T2> ostream &operator<<(ostream &os, const pair<T1, T2> &a) { return os << "(" << a.first << ", " << a.second << ")"; };
template <class T> ostream &operator<<(ostream &os, const vector<T> &as) { const int sz = as.size(); os << "["; for (int i = 0; i < sz; ++i) { if (i >= 256) { os << ", ..."; break; } if (i > 0) { os << ", "; } os << as[i]; } return os << "]"; }
template <class T> void pv(T a, T b) { for (T i = a; i != b; ++i) cerr << *i << " "; cerr << endl; }
template <class T> bool chmin(T &t, const T &f) { if (t > f) { t = f; return true; } return false; }
template <class T> bool chmax(T &t, const T &f) { if (t < f) { t = f; return true; } return false; }
#define COLOR(s) ("\x1b[" s "m")

////////////////////////////////////////////////////////////////////////////////
template <unsigned M_> struct ModInt {
  static constexpr unsigned M = M_;
  unsigned x;
  constexpr ModInt() : x(0U) {}
  constexpr ModInt(unsigned x_) : x(x_ % M) {}
  constexpr ModInt(unsigned long long x_) : x(x_ % M) {}
  constexpr ModInt(int x_) : x(((x_ %= static_cast<int>(M)) < 0) ? (x_ + static_cast<int>(M)) : x_) {}
  constexpr ModInt(long long x_) : x(((x_ %= static_cast<long long>(M)) < 0) ? (x_ + static_cast<long long>(M)) : x_) {}
  ModInt &operator+=(const ModInt &a) { x = ((x += a.x) >= M) ? (x - M) : x; return *this; }
  ModInt &operator-=(const ModInt &a) { x = ((x -= a.x) >= M) ? (x + M) : x; return *this; }
  ModInt &operator*=(const ModInt &a) { x = (static_cast<unsigned long long>(x) * a.x) % M; return *this; }
  ModInt &operator/=(const ModInt &a) { return (*this *= a.inv()); }
  ModInt pow(long long e) const {
    if (e < 0) return inv().pow(-e);
    ModInt a = *this, b = 1U; for (; e; e >>= 1) { if (e & 1) b *= a; a *= a; } return b;
  }
  ModInt inv() const {
    unsigned a = M, b = x; int y = 0, z = 1;
    for (; b; ) { const unsigned q = a / b; const unsigned c = a - q * b; a = b; b = c; const int w = y - static_cast<int>(q) * z; y = z; z = w; }
    assert(a == 1U); return ModInt(y);
  }
  ModInt operator+() const { return *this; }
  ModInt operator-() const { ModInt a; a.x = x ? (M - x) : 0U; return a; }
  ModInt operator+(const ModInt &a) const { return (ModInt(*this) += a); }
  ModInt operator-(const ModInt &a) const { return (ModInt(*this) -= a); }
  ModInt operator*(const ModInt &a) const { return (ModInt(*this) *= a); }
  ModInt operator/(const ModInt &a) const { return (ModInt(*this) /= a); }
  template <class T> friend ModInt operator+(T a, const ModInt &b) { return (ModInt(a) += b); }
  template <class T> friend ModInt operator-(T a, const ModInt &b) { return (ModInt(a) -= b); }
  template <class T> friend ModInt operator*(T a, const ModInt &b) { return (ModInt(a) *= b); }
  template <class T> friend ModInt operator/(T a, const ModInt &b) { return (ModInt(a) /= b); }
  explicit operator bool() const { return x; }
  bool operator==(const ModInt &a) const { return (x == a.x); }
  bool operator!=(const ModInt &a) const { return (x != a.x); }
  bool operator<(const ModInt &a) const { return (x < a.x); }
  friend std::ostream &operator<<(std::ostream &os, const ModInt &a) { return os << a.x; }
};
////////////////////////////////////////////////////////////////////////////////

constexpr unsigned MO = 1000000007;
using Mint = ModInt<MO>;


int N, M;
vector<pair<int, int>> E;

vector<vector<int>> graph, hparg;

vector<pair<int, Mint>> ans;

void go(int src) {
  int len = 0;
  Mint key = 0;
  vector<int> vis(N, 0);
  for (int u = src; ; ) {
    (key *= 10) += (u + 1);
    vis[u] = 1;
    if (++len == N) {
      ans.emplace_back(src, key);
      return;
    }
    int vm = -1;
    for (const int v : graph[u]) if (!vis[v]) {
      if (~vm) return;
      vm = v;
    }
    if (!~vm) return;
    u = vm;
  }
}
void og(int snk) {
  int len = 0;
  Mint key = 0, ten = 1;
  vector<int> vis(N, 0);
  for (int u = snk; ; ) {
    key += ten * (u + 1);
    ten *= 10;
    vis[u] = 1;
    if (++len == N) {
      // OK
      ans.emplace_back(u, key);
      return;
    }
    int vm = -1;
    for (const int v : hparg[u]) if (!vis[v]) {
      if (~vm) return;
      vm = v;
    }
    if (!~vm) return;
    u = vm;
  }
}

int main() {
  for (int numCases; ~scanf("%d", &numCases); ) { for (int caseId = 1; caseId <= numCases; ++caseId) {
    scanf("%d%d", &N, &M);
    E.resize(M);
    for (int i = 0; i < M; ++i) {
      scanf("%d%d", &E[i].first, &E[i].second);
      --E[i].first;
      --E[i].second;
    }
    sort(E.begin(), E.end());
    E.erase(unique(E.begin(), E.end()), E.end());
    M = E.size();
    
    graph.assign(N, {});
    hparg.assign(N, {});
    for (int i = 0; i < M; ++i) {
      const int u = E[i].first, v = E[i].second;
      graph[u].push_back(v);
      hparg[v].push_back(u);
    }
    
    ans.clear();
    // for (int u = 0; u < N; ++u) go(u);
    for (int u = 0; u < N; ++u) og(u);
    
// cerr<<"ans = "<<ans<<endl;
    sort(ans.begin(), ans.end());
    printf("%d\n", (int)ans.size());
    if (ans.size()) {
      for (int i = 0; i < (int)ans.size(); ++i) {
        if (i) printf(" ");
        printf("%u", ans[i].second.x);
      }
      puts("");
    }
  }
#ifndef LOCAL
  break;
#endif
  }
  return 0;
}