#include<bits/stdc++.h>
using namespace std;
struct Node{
	long long x,y;
	long long sum;
}a[1000005];
bool cmp(Node a,Node b){
	if(a.sum==b.sum){
		if(a.x==b.x)
			return a.y<b.y;
		return a.x<b.x;
	}
	return a.sum<b.sum;
}
signed main(){
    ios::sync_with_stdio(0);
	cin.tie(nullptr);
	int n;
	cin>>n;
	for(int i=1;i<=n;i++){                                                   
		cin>>a[i].x>>a[i].y;
		a[i].sum=a[i].x*a[i].x+a[i].y*a[i].y;
	}            
	sort(a+1,a+n+1,cmp);
	for(int i=1;i<=n;i++){
		cout<<a[i].x<<" "<<a[i].y<<"\n"; 
	}                            
	return 0;
}