#include<iostream>
#include<vector>
#include<cmath>
using namespace std;

struct point {
      int x, y;
};

struct point_pair {
      point a, b;
};
double calc_distance(point_pair pair)
{
  return (sqrt((pair.a.x - pair.b.x) * (pair.a.x - pair.b.x) + (pair.a.y - pair.b.y) * (pair.a.y - pair.b.y)));
}
int main() {
      int n;
      cin>>n;
      vector<point> points(n);
      for(int i=0; i<n; i++) {
            cin>>points[i].x>> points[i].y;
      }
      for(int i=0; i<n; i++) {
            cout<<points[i].x<<" "<< points[i].y<<endl;
      }
      for(int i=0; i<n; i++) {
            for(int j=i+1; j<n; j++) {
                  point_pair pair;
                  pair.a = points[i];
                  pair.b = points[j];
                  cout<<"distance between: "<<pair.a.x<<" "<<pair.a.y<<" and "<<pair.b.x<<" "<<pair.b.y<<" is: ";
                  cout<<calc_distance(pair)<<endl;
            }
      }
      return 0;
}