#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define MAX_N 1000001
#define mod 1000000007
 
 
 
int main(){
 
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);
    map<int, int> mp;
 for(pair<int, int> it:mp){
    cout << it.first << " " << it.second << endl;
 }
 for(auto it=mp.begin();it!=mp.end();it++){
    cout << (*it).first << " " << (*it).second << endl;
 }
 for(auto it=mp.rbegin();it != mp.rend();it++){
    cout << (*it).first << " " << (*it).second << endl;
 }
}
 

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