#include<bits/stdc++.h>
using namespace std;
using ll = long long;
// #define endl '\n'

int bit_length(int x){
	int c = 1;
	int i = 0;
	while(c <= x){
		i++;
		c *= 2;
	}
	return i;
}

void solve(){
	int n;
	cin >> n;
	vector<int> A(n);
	int x = 0;
	vector<set<int>> se(20, set<int>());
	for(int i = 0; i < n; i++){
		cin >> A[i];
		x ^= A[i];
		for(int j = 0; j < 20; j++){
			if((A[i] >> j) & 1) se[j].insert(i);
		}
	}
	bool turn;
	if(x == 0){
		cout << 0 << endl;
		turn = false;
	}
	else{
		cout << 1 << endl;
		turn = true;
	}
	int ret;
	while(1){
		if(turn){
			assert(x != 0);
			int b = bit_length(x) - 1;
			auto it = se[b].begin();
			int	i = (*it);
			int	a = A[i];
			for(int j = 0; j < 20; j++){
				if((a >> j) & 1) se[j].erase(i);
			}
			int d = a - (a ^ x);
			cout << i + 1 << " " << d << endl;
			cin >> ret;
			if(ret == -1) return;
			a -= d;
			A[i] = a;
			x = 0;
			for(int j = 0; j < 20; j++){
				if((a >> j) & 1) se[j].insert(i);
			}
		}
		else{
			assert(x == 0);
			int i, k;
			cin >> i >> k;
			i--;
			cin >> ret;
			if(ret == -1) return;
			int a = A[i];
			for(int j = 0; j < 20; j++){
				if((a >> j) & 1) se[j].erase(i);
			}
			x ^= a;
			a -= k;
			x ^= a;
			A[i] = a;
			for(int j = 0; j < 20; j++){
				if((a >> j) & 1) se[j].insert(i);
			}
		}
		turn = turn ^ true;
	}
}

int main(){
	solve();
}