#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 <map>
#include <numeric>
#include <queue>
#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; }


int N;
vector<int> A;

int main() {
  scanf("%d", &N);
  A.resize(N);
  for (int i = 0; i < N; ++i) {
    scanf("%d", &A[i]);
  }
  
  int now = 0;
  for (int i = 0; i < N; ++i) {
    now ^= A[i];
  }
  printf("%d\n", (now != 0) ? 1 : 0);
  fflush(stdout);
  
  map<int, set<int>> iss;
  for (int i = 0; i < N; ++i) {
    iss[A[i]].insert(i);
  }
  
  auto update = [&](int i, int k) -> void {
    now ^= A[i];
    iss[A[i]].erase(i);
    if (iss[A[i]].empty()) {
      iss.erase(A[i]);
    }
    A[i] -= k;
    now ^= A[i];
    iss[A[i]].insert(i);
  };
  
  for (; ; ) {
// cerr<<"now = "<<now<<endl;for(const auto&kv:iss){cerr<<"iss["<<kv.first<<"] = ";pv(kv.second.begin(),kv.second.end());}
    if (now != 0) {
      for (auto it = iss.begin(); it != iss.end(); ++it) {
        const int a = it->first;
        const int k = a - (a ^ now);
        if (k > 0) {
          const int i = *it->second.begin();
          printf("%d %d\n", i + 1, k);
          fflush(stdout);
          int res;
          scanf("%d", &res);
          if (res == -1) exit(0);
          update(i, k);
          break;
        }
      }
    }
    {
      int i, k;
      scanf("%d%d", &i, &k);
      int res;
      scanf("%d", &res);
      if (res == -1) exit(0);
      --i;
      update(i, k);
    }
  }
  
  return 0;
}