using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder sb = new StringBuilder();

            while (true)
            {
                int n = int.Parse(Console.ReadLine());

                if (n == 0) break;

                Circle[] circles = new Circle[n];

                for (int i = 0; i < n; i++)
                {
                    double[] input = Array.ConvertAll(Console.ReadLine().Split(' '), double.Parse);

                    circles[i] = new Circle(new Point(input[0], input[1]), input[2]);
                }

                int m = int.Parse(Console.ReadLine());

                for (int i = 0; i < m; i++)
                {
                    double[] input = Array.ConvertAll(Console.ReadLine().Split(' '), double.Parse);

                    Point t = new Point(input[0], input[1]);
                    Point s = new Point(input[2], input[3]);

                    sb.AppendLine(CheckPos(circles, t, s) ? "Safe" : "Danger");
                }
            }
            Console.Write(sb);
        }

        static bool CheckPos(Circle[] circles, Point t, Point s)
        {
            int n = circles.Length;

            for (int j = 0; j < n; j++)
            {
                double d1 = (t - circles[j].p).Abs;
                double d2 = (s - circles[j].p).Abs;

                if (d1 < circles[j].r ^ d2 < circles[j].r)
                {
                    return true;
                }

                if (d1 > circles[j].r && d2 > circles[j].r)
                {
                    if (GetDistSP(t, s, circles[j].p) <= circles[j].r)
                    {
                        return true;
                    }
                }
            }
            return false;
        }

        static double GetDistSP(Point t, Point s, Point c)
        {
            if ((s - t).Dot(c - t) < 0.0) return (c - t).Abs;
            if ((t - s).Dot(c - s) < 0.0) return (c - s).Abs;
            return GetDistLP(t, s, c);
        }

        static double GetDistLP(Point t, Point s, Point c)
        {
            return Math.Abs((s - t).Cross(c - t) / (s - t).Abs);
        }
    }

    class Point : IComparable
    {
        static readonly double EPS = 1E-10;

        internal double x, y;

        public Point(double x, double y)
        {
            this.x = x;
            this.y = y;
        }

        public double Abs { get { return Math.Sqrt(Norm); } }
        public double Norm { get { return x * x + y * y; } }

        public double Dot(Point p) { return x * p.x + y * p.y; }
        public double Cross(Point p) { return x * p.y - y * p.x; }
        public double Distance(Point p) { return (this - p).Abs; }

        public static Point operator +(Point a, Point b) { return new Point(a.x + b.x, a.y + b.y); }
        public static Point operator -(Point a, Point b) { return new Point(a.x - b.x, a.y - b.y); }
        public static Point operator *(Point p, double d) { return new Point(p.x * d, p.y * d); }
        public static Point operator *(Point a, Point b) { return new Point(a.x * b.x - a.y * b.y, a.x * b.y + a.y * b.x); }
        public static Point operator /(Point p, double d) { return new Point(p.x / d, p.y / d); }
        public static bool operator <(Point a, Point b) { return Math.Abs(a.x - b.x) > EPS ? a.x < b.x : a.y < b.y; }
        public static bool operator >(Point a, Point b) { return Math.Abs(a.x - b.x) > EPS ? a.x > b.x : a.y > b.y; }
        public static bool operator ==(Point a, Point b) { return Math.Abs(a.x - b.x) < EPS && Math.Abs(a.y - b.y) < EPS; }
        public static bool operator !=(Point a, Point b) { return Math.Abs(a.x - b.x) >= EPS || Math.Abs(a.y - b.y) >= EPS; }

        public int CompareTo(object obj)
        {
            var other = obj as Point;
            if (obj == null) return -1;

            ComparerX compX = new ComparerX();
            return compX.Compare(this, other);
        }

        public override bool Equals(object obj)
        {
            var other = obj as Point;
            return Math.Abs(x - other.x) < EPS && Math.Abs(y - other.y) < EPS;
        }

        public override int GetHashCode()
        {
            return x.GetHashCode() ^ y.GetHashCode();
        }

        public override string ToString()
        {
            return string.Format("{0:f10} {1:f10}", x, y);
        }
    }

    class ComparerX : IComparer<Point>
    {
        static readonly double EPS = 1E-10;

        public int Compare(Point a, Point b)
        {
            if (a.x - b.x < -EPS) return -1;
            if (a.x - b.x > EPS) return 1;
            if (a.y - b.y < -EPS) return -1;
            if (a.y - b.y > EPS) return 1;
            return 0;
        }
    }

    class ComparerY : IComparer<Point>
    {
        static readonly double EPS = 1E-10;

        public int Compare(Point a, Point b)
        {
            if (a.y - b.y < -EPS) return -1;
            if (a.y - b.y > EPS) return 1;
            if (a.x - b.x < -EPS) return -1;
            if (a.x - b.x > EPS) return 1;
            return 0;
        }
    }

    class Circle
    {
        internal Point p;
        internal double r;

        public Circle(Point p, double r)
        {
            this.p = p;
            this.r = r;
        }
    }
}

Measured memory_bytes: 9244