#include<iostream>
#include<queue>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<iomanip>
#include<map>
#include<cstdlib>
#include<cmath>
#include<vector>
#define LL long long
#define IT __int64
#define zero(x) fabs(x)<eps
#define mm(a,b) memset(a,b,sizeof(a))
const int INF=0x7fffffff;
const double inf=1e8;
const double eps=1e-10;
const double PI=acos(-1.0);
const int Max=20001;
using namespace std;
int sign(double x)
{
    return (x>eps)-(x<-eps);
}
typedef struct NODE
{
    double x;
    double y;
    double r;
    void input()
    {
        scanf("%lf%lf%lf",&x,&y,&r);
    }
    void output()
    {
        cout<<x<<" "<<y<<" "<<r<<endl;
    }
}point;
point start,node[Max];
typedef struct LINE
{
    double st;
    double ed;
}Line;
Line line[Max],interval[Max];
double xmult(point p0,point p1,point p2)
{
	return(p1.x-p0.x)*(p2.y-p0.y)-(p2.x-p0.x)*(p1.y-p0.y);
}
double dmult(point p0,point p1,point p2)
{
	return(p1.x-p0.x)*(p2.x-p0.x)+(p1.y-p0.y)*(p2.y-p0.y);
}
double Distance(point p1,point p2)// 返回两点之间欧氏距离
{
	return( sqrt( (p1.x-p2.x)*(p1.x-p2.x)+(p1.y-p2.y)*(p1.y-p2.y) ) );
}
bool cmp(Line u,Line v)
{
    return u.st<v.st;
}
int main()
{
    int n,m,i,j;
    while(cin>>n&&n)
    {
        scanf("%lf%lf",&start.x,&start.y);
        for(i=0;i<n;i++)
        {
            node[i].input();
            double L,as1,as2,A,B;
            L=Distance(start,node[i]);
            as1=node[i].r/L;
            A=asin(as1);
            as2=(start.x-node[i].x)/L;
            B=asin(as2);
            line[i].st=start.x-start.y*tan(A+B);
            line[i].ed=start.x-start.y*tan(B-A);
        }
        sort(line,line+n,cmp);
        double L=line[0].st,R=line[0].ed;
        m=0;
        interval[m]=line[0];
        //cout<<line[0].st<<" "<<line[0].ed<<endl;
        for(i=1;i<n;i++)
        {
            if(interval[m].ed>=line[i].st)
                interval[m].ed=max(line[i].ed,interval[m].ed);
            else
            {
                interval[++m]=line[i];
            }
        }
        for(i=0;i<=m;i++)
        cout<<setprecision(2)<<setiosflags(ios::fixed)<<interval[i].st<<" "<<interval[i].ed<<endl;
        cout<<endl;
    }
    return 0;
}