#include <iostream>
#include <complex>
#include <cstdio>

using namespace std;

#define X real()
#define Y imag()

const double EPS = 1e-8;

typedef complex<double> Point;

bool operator< (const Point& p1, const Point& p2) {
  return p1.X != p2.X ? p1.X < p2.X : p1.Y < p2.Y;
}

double dot(const Point& p1, const Point& p2) {
  return (conj(p1)*p2).X;
}

typedef Point Vector;

int main() {
  Point p0, p1;
  double x, y;
  
  cin >> x >> y; p0 = Point(x, y);
  cin >> x >> y; p1 = Point(x, y);
  
  Vector v0 = p1 - p0;
  
  int q;
  cin >> q;
  while(q--) {
	cin >> x >> y;
	Vector v1 = Point(x, y) - p0;
	Point ans = p0 + dot(v0, v1) * v0 / norm(v0);
	printf("%.9lf %.9lf\n", ans.X, ans.Y);
  }
  
  return 0;
}