#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;

//ノルム
double norm(double x, double y){
    return x*x + y*y;
}
//内積
double dot(double x1, double y1, double x2, double y2){
    return x1*x2 + y1*y2;
}

int main(){
    double xp1,yp1,xp2,yp2;
    int q;

    //標準入力
    cin >> xp1;
    cin >> yp1;
    cin >> xp2;
    cin >> yp2;
    cin >> q;

    double xv = xp2 - xp1;
    double yv = yp2 - yp1;
    double vnorm = norm(xv, yv);

    for(int i=0; i<q; i++){
        double xp,yp;
        cin >> xp;
        cin >> yp;

        double xu = xp - xp1;
        double yu = yp - yp1;

        double uvdot = dot(xv,yv,xu,yu);
        double x = double(xp1) + uvdot/vnorm*double(xv);
        double y = double(yp1) + uvdot/vnorm*double(yv);

        std::cout << setprecision(14) << x << " " << y << "\n";
    }

    return 0;
}

