#include <bits/stdc++.h>
using namespace std;

struct Point {
    int x, y;

    Point() = default;
    Point(int x, int y) : x(x), y(y) {}

    Point operator+(const Point &rhs) const {
        return Point(x + rhs.x, y + rhs.y);
    }
    Point operator-(const Point &rhs) const {
        return Point(x - rhs.x, y - rhs.y);
    }
    long long operator*(const Point &rhs) const {
        return 1ll * x * rhs.x + 1ll * y * rhs.y;
    }
    long long operator%(const Point &rhs) const {
        return x * rhs.y - y * rhs.x;
    }
};

int main() {
    Point p1, p2;
    cin >> p1.x >> p1.y;
    cin >> p2.x >> p2.y;
    int q; cin >> q;

    Point d = p2 - p1;
    double l = sqrt(d * d);
    double dx = d.x / l;
    double dy = d.y / l;

    while (q--) {
        Point p; cin >> p.x >> p.y;
        long long dot = (p - p1) * (p2 - p1);
        double dist = dot / l;
        double fx = p1.x + dx * dist;
        double fy = p1.y + dy * dist;
        cout << fixed << setprecision(20) << fx << ' ' << fy << endl;
    }
}

