import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;
import std.typecons;

T read(T)() { return readln.chomp.to!T; }
T[] reads(T)() { return readln.split.to!(T[]); }
alias readint = read!int;
alias readints = reads!int;

void calc(Vec2 p, Vec2 a, Vec2 b) {
    auto ab = b - a;
    auto ap = p - a;

    auto e = ab.normalized;
    // ベクトル ap のベクトル ab への正射影ベクトル ax を求める
    auto ax = ap.dot(e) * e;
    auto x = a + ax;
    writefln("%.8f %.8f", x.x, x.y);
}

void main() {
    auto xs = readints();
    auto p1 = Vec2(xs[0], xs[1]);
    auto p2 = Vec2(xs[2], xs[3]);

    int q = readint();
    for (int i = 0; i < q; i++) {
        auto xy = readints();
        auto p = Vec2(xy[0], xy[1]);
        calc(p, p1, p2);
    }
}

struct Vec2 {
    immutable double x;
    immutable double y;

    this(double x, double y) {
        this.x = x;
        this.y = y;
    }

    Vec2 opAdd(Vec2 other) {
        return Vec2(this.x + other.x, this.y + other.y);
    }

    Vec2 opSub(Vec2 other) {
        return Vec2(this.x - other.x, this.y - other.y);
    }

    Vec2 opMul(double d) {
        return Vec2(this.x * d, this.y * d);
    }

    double dot(Vec2 other) {
        return this.x * other.x + this.y * other.y;
    }

    double cross(Vec2 other) {
        return this.x * other.y - other.x * this.y;
    }

    double mag() {
        return sqrt(magSq());
    }

    double magSq() {
        return this.x * this.x + this.y * this.y;
    }

    Vec2 normalized() {
        auto m = mag();
        if (m != 0 && m != 1)
            return Vec2(this.x / m, this.y / m);
        return this;
    }

    static double distance(Vec2 a, Vec2 b) {
        return (a - b).mag();
    }
}

