#include<cstdio>
using namespace std;
class point{
public:
    double x,y;
    point(double x=0,double y=0):x(x),y(y){};               //1.记得设初值
    point operator +(point a){
        return point(x+a.x,y+a.y);
    }
    point operator -(point a){
        return point(x-a.x,y-a.y);
    }
    double operator *(point a){
        return x*a.x+y*a.y;
    }
    point operator *(double a){
        return point(x*a,y*a);
    }
    void print(){
        printf("%.10lf %.10lf\n",x,y);
    }
};
struct segment{
    point p1,p2,base;
    segment(point a,point b){                                          //1.不然无法构造形参
        p1=a,p2=b,base=b-a;
    }
};
void project(segment s,point p){
    double r=(p-s.p1)*s.base/(s.base*s.base);
    (s.p1+s.base*r).print();
    return;
}
int main(){
    int n;
    double x1,y1,x2,y2;
    scanf("%lf%lf%lf%lf",&x1,&y1,&x2,&y2);
    segment s(point(x1,y1),point(x2,y2));
    scanf("%d",&n);
    for(int i=1;i<=n;++i){
        scanf("%lf%lf",&x1,&y1);
        project(s,point(x1,y1));
    }
    return 0;
}
