/* -*- coding: utf-8 -*-
 *
 * 2165.cc:  No.2165 Let's Play Nim! - yukicoder
 */

#include<cstdio>
#include<set>
#include<algorithm>
#include<utility>
#include<functional>
 
using namespace std;

/* constant */

const int MAX_N = 75000;
const int BN = 17;

enum { First = 1, Second = 0 };

/* typedef */

typedef pair<int,int> pii;
typedef set<pii> spii;

/* global variables */

int as[MAX_N];
spii bps[BN];

/* subroutines */

inline int msb(int x) {
  int k = 0, bk = 1;
  while ((bk << 1) <= x) k++, bk <<= 1;
  //printf("msb(%d)=%d\n", x, k);
  return k;
}

void replace(int i, int ai) {
  bps[msb(as[i])].erase(pii(as[i], i));
  if (ai > 0) bps[msb(ai)].insert(pii(ai, i));
  as[i] = ai;
}

int my_act(int x) {
  int i = bps[msb(x)].begin()->second;
  int ai = x ^ as[i], k = as[i] - ai;
  replace(i, ai);

  printf("%d %d\n", i + 1, k); fflush(stdout);
  int r;
  scanf("%d", &r);
  return r;
}

int judge_act() {
  int i, k, r;
  scanf("%d%d%d", &i, &k, &r), i--;

  int ai = as[i] - k, x = as[i] ^ ai;
  replace(i, ai);

  return (r < 0) ? -1 : x;
}

/* main */

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) scanf("%d", as + i);

  int x = 0;
  for (int i = 0; i < n; i++) {
    x ^= as[i];
    bps[msb(as[i])].insert(pii(as[i], i));
  }

  if (x != 0) {
    printf("%d\n", First), fflush(stdout);
    my_act(x);
  }
  else
    printf("%d\n", Second), fflush(stdout);

  for (;;) {
    int x = judge_act();
    if (x < 0) break;

    int r = my_act(x);
    if (r < 0) break;
  }

  return 0;
}