#include <bits/stdc++.h>
using namespace std;
template <typename S, typename T>
ostream& operator<<(ostream& out, pair<S, T> const& p) {
  out << '(' << p.first << ", " << p.second << ')';
  return out;
}
template <typename T>
ostream& operator<<(ostream& out, vector<T> const& v) {
  long long l = v.size();
  for (long long i = 0; i < l - 1; i++) out << v[i] << ' ';
  if (l > 0) out << v[l - 1];
  return out;
}
template <typename T>
void trace(const char* name, T&& arg1) {
  cout << name << " : " << arg1 << "\n";
}
template <typename T, typename... Args>
void trace(const char* names, T&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cout.write(names, comma - names) << " : " << arg1 << " | ";
  trace(comma + 1, args...);
}
void solve() {
  int n;
  cin >> n;
  vector<int> arr(n);
  for (int i = 0; i < n; i++) {
    cin >> arr[i];
  }
  vector<int> ans;
  ans.push_back(arr[0]);
  ans.push_back(arr[1]);
  bool inc = arr[1] > arr[0];
  for (int i = 2; i < n; i++) {
    if (arr[i] > arr[i - 1]) {
      if (!inc) {
        ans.push_back(arr[i]);
        inc = true;
      } else {
        ans.back() = arr[i];
      }
    } else {
      if (inc) {
        ans.push_back(arr[i]);
        inc = false;
      } else {
        ans.back() = arr[i];
      }
    }
  }
  cout << ans.size() << "\n";
  for (auto i : ans) {
    cout << i << " ";
  }
  cout << "\n";
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  int t;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
