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

const int N=1000010;
int n;
pair<int,int>s,t;
int x1[N],x2[N],y[N];

vector<pair<int,int>>v;
void Solve(int l,int r,pair<int,int>s,pair<int,int>t){
	if(l>r)return;
	for(int i=l;i<=r;i++){
		double px=s.first+(double)(t.first-s.first)*(y[i]-s.second)/(t.second-s.second);
		if(x1[i]<=px&&px<=x2[i])continue;
		pair<int,int>tmp={0,0};
		if(px<x1[i])tmp={x1[i],y[i]};
		else tmp={x2[i],y[i]};
		Solve(l,i-1,s,tmp);
		v.push_back(tmp);
		Solve(i+1,n,tmp,t);
		return;
	}
}
signed main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	
	cin>>n;
	cin>>s.first>>s.second>>t.first>>t.second;
	for(int i=1;i<=n;i++)cin>>x1[i]>>x2[i]>>y[i];
	
	v.push_back(s);
	Solve(1,n,s,t);
	v.push_back(t);
	
	cout<<v.size()<<'\n';
	for(auto pr:v)cout<<pr.first<<' '<<pr.second<<'\n';
}