#include<bits/stdc++.h>
using namespace std;
#define EPS (1e-10)
#define equals(a, b) (fabs((a) - (b)) < EPS)

class Point
{
    public:
    double x, y;

    Point(double x = 0, double y = 0): x(x), y(y) {}

    Point operator + (Point p) {return Point(x + p.x, y + p.y); }
    Point operator - (Point p) {return Point(x - p.x, y - p.y); }
    Point operator * (double a) {return Point(x * a, y * a);}
    Point operator / (double a) {return Point(x / a, y / a);}

    double abs() {return sqrt(norm());}
    double norm() {return x * x + y * y;}
    
    bool operator < (const Point &p) const {
        return x != p.x ? x < p.x : y < p.y;
    }

    bool operator == (const Point &p) const{
        return equals(x, p.x) && equals(y, p.y);
    }
};typedef Point Vector;

struct Circle {
    Point c;
    double r;
    Circle(Point c,double r):c(c), r(r){}
};

struct Segment {
    Point p1, p2;
    Segment(Point p1, Point p2):p1(p1), p2(p2){}
};typedef Segment Line;

double dot(Vector a, Vector b){
    return a.x * b.x + a.y * b.y;
}

double cross(Vector a, Vector b){
    return a.x * b.y - a.y * b.x;
}
Point projection(Segment s, Point p){
    Vector base = s.p2 - s.p1;
    double r = dot(p-s.p1, base) / base.norm();
    return s.p1 + base * r;
}

int ccw(Point p0, Point p1, Point p2){
    Vector a = p1 - p0, b = p2 - p0;
    if (cross(a, b) > EPS) return 1;
    if (cross(a, b) < -EPS) return -1;
    if (dot(a, b) < -EPS) return 2;
    if (a.norm() < b.norm()) return -2;
    return 0;
}
bool intersection(Point p0, Point p1, Point p2, Point p3){
    if (ccw(p0, p1, p2) == 0 || ccw(p0, p1, p3) == 0 || 
        ccw(p2, p3, p0) == 0 || ccw(p2, p3, p1) == 0)
        return true;
    if (ccw(p0, p1, p2) * ccw(p0, p1, p3) == -1 && ccw(p2, p3, p0) * ccw(p2, p3, p1) == -1)
        return true;
    return false;
}
pair<Point, Point> getCrossPoints(Circle c, Line l){
    Vector pr = projection(l, c.c);
    Vector e = (l.p2 - l.p1) / (l.p2 - l.p1).abs();
    double base = sqrt(c.r * c.r - (pr - c.c).norm());
    return make_pair(pr + e * base, pr - e * base);
}
int main(){
    int cx, cy, r, q; cin >> cx >> cy >> r >> q;
    Circle c = Circle(Point(cx, cy), r);
    int x1, y1, x2, y2;
    for (int i = 0; i < q; i++)
    {
        cin >> x1 >> y1 >> x2 >> y2;
        Line l = Line(Point(x1, y1), Point(x2, y2));
        pair<Point, Point> p = getCrossPoints(c, l);
        if (p.first.x < p.second.x)
            cout << fixed << setprecision(10) 
            << p.first.x << " " << p.first.y << " "
            << p.second.x << " " << p.second.y << endl;
        else if(p.first.x > p.second.x)
            cout << fixed << setprecision(10) 
            << p.second.x << " " << p.second.y << " "
            << p.first.x << " " << p.first.y << endl;
        else if (equals(p.first.x, p.second.x))
            if (equals(p.first.y, p.second.y))
            cout << fixed << setprecision(10) 
            << p.first.x << " " << p.first.y << " "
            << p.second.x << " " << p.second.y << endl;
            else if (p.first.y < p.second.y)
            cout << fixed << setprecision(10) 
            << p.first.x << " " << p.first.y << " "
            << p.second.x << " " << p.second.y << endl;
            else if(p.first.y > p.second.y)
            cout << fixed << setprecision(10) 
            << p.second.x << " " << p.second.y << " "
            << p.first.x << " " << p.first.y << endl;
    }
    

}


Measured memory_bytes: 3248