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

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define ALL(v) (v).begin(), (v).end()
#define br() p("")
#define pn(s) cout << (#s) << " " << (s) << endl
#define p_yes() p("Yes")
#define p_no() p("No")

const ll mod = 1e9 + 7;
const ll inf = 1e18;

// 複素数雨セット
typedef complex<double> C;
// 内積
double dot(C a, C b){
    return a.real() * b.real() + a.imag() * b.imag();
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    // input
    ll x1, y1, x2, y2;
    cin >> x1 >> y1 >> x2 >> y2;

    C p1(x1, y1);
    C p2(x2, y2);
    C v = p2 - p1;
    C n = v / abs(v);

    ll Q; cin >> Q;
    while(Q--){
        ll x, y;
        cin >> x >> y;
        C p(x, y);

        auto v = p - p1;
        auto ans = p1 + dot(v, n) * n;
        cout << setprecision(20);
        cout << ans.real() << ' ' << ans.imag() << endl;
    }
    
    return 0;
}
