#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N; cin >> N;
    vector<long long> A(N);
    for(auto &a : A) cin >> a;

    vector<long long> grundy(61);
    for(int i=1; i<=60; i++){
        vector<int> appear;
        for(int k=0; k<6; k++){
            if(i&(1<<k)) appear.push_back(grundy.at(k));
        }
        sort(appear.begin(),appear.end());

        int now = 0;
        for(auto ap : appear){
            if(ap > now) break;
            if(ap == now) now++;
        }
        grundy.at(i) = now;
    }
    
    int minus = 0,xora = 0,plus = 0;
    for(int i=0; i<N; i++){
        long long a = A.at(i);
        if(a < 0){minus++; continue;}
        if(a == 0) continue;

        plus++;
        if(a <= 60){xora ^= grundy.at(a); continue;}

        vector<int> appear;
        for(int k=0; k<60; k++){
            if(a&(1LL<<k)) appear.push_back(grundy.at(k));  
        }
        sort(appear.begin(),appear.end());
        
        int now = 0;
        for(auto ap : appear){
            if(ap > now) break;
            if(ap == now) now++;
        }
        xora ^= now;
        cout << a << " " << now << endl;
    }
    if(xora == 0 && minus%2 == 0) cout << 2 << endl;
    else cout << 1 << endl;
}