include<bits/stdc++.h>

using namespace std; struct Point { int x,y; }; bool comp(Point a,Point b) { if(a.x!=b.x) { return a.x<b.x; }

if(a.y!=b.y) { return a.y>b.y; } } int main() { vector<Point>v; int x,y; while(cin>>x>>y) { v.push_back({x,y});

}
sort(v.begin(),v.end(),comp);
for(int i=0; i<v.size(); i++)
{
    cout<<v[i].x<<" "<<v[i].y<<endl;
}

}

include <bits/stdc++.h>

using namespace std;

typedef long long ll; typedef long double ld;

bool mySort(pair<int, int> a, pair<int, int> b) { if (a.first != b.first) return a.first < b.first; else return a.second > b.second; }

void solve() {

int a, b;
vector<pair<int, int>> v;
while (cin >> a >> b)
    v.push_back({ a, b });

sort(v.begin(), v.end(), mySort);
for (auto p : v)
    cout << p.first << " " << p.second << endl;

}

int main() { iosbase::syncwith_stdio(false), cin.tie(NULL), cout.tie(NULL);

ifdef _DEBUG

freopen("input-1.txt", "r", stdin);

endif

solve();
return 0;

} //hacked by **