#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>

void solve() {
    int n, k1, k2;
    std::cin >> n >> k1 >> k2;

    bool first1 = true;
    if (k1 > k2) {
        first1 = false;
        std::swap(k1, k2);
    }
    // k1 < k2

    std::set<int> s1;
    for (int i = 0; i <= n + 1; ++i) s1.insert(i);
    auto s2 = s1;

    int m;
    std::cin >> m;

    std::map<int, std::vector<int>> ts;
    for (int i = 1; i <= m; ++i) {
        int a, b;
        std::cin >> a >> b;
        ts[a].push_back(i);
        ts[a + b].push_back(-i);
    }

    auto max = [&](int l, int r) -> int {
        int dl = k1 - l, dr = r - k2;
        if (dl != dr) {
            return dl < dr ? l : r;
        } else {
            return first1 ? l : r;
        }
    };

    auto get = [&]() -> int {
        int l = *(--s1.lower_bound(k2));
        int r = *s1.lower_bound(k2);
        int i = max(l, r);

        if (i == 0 || i == n + 1) {
            l = *(--s2.lower_bound(k2));
            r = *s2.lower_bound(k2);
            i = max(l, r);

            if (i == 0 || i == n + 1) return -1;
        }

        for (int j = i - 1; j <= i + 1; ++j) {
            if (1 <= j && j <= n) s1.erase(j);
        }
        s2.erase(i);
        return i;
    };

    auto check = [&](int i) -> bool {
        if (i == 0 || i == n + 1) return false;
        for (int d = -1; d <= 1; ++d) {
            if (!s2.count(i + d)) return false;
        }
        return true;
    };

    auto dump = [&]() {
        std::cerr << "\ns1: ";
        for (auto i : s1)
            if (1 <= i && i <= n) std::cerr << i << " ";
        std::cerr << "\n";
        std::cerr << "s2: ";
        for (auto i : s2)
            if (1 <= i && i <= n) std::cerr << i << " ";
        std::cerr << "\n";
    };

    std::vector<int> ans(m);
    std::queue<int> que;
    for (const auto& [t, v] : ts) {
        for (auto x : v) {
            if (x < 0) {
                // dump();

                int i = ans[-x - 1];

                s2.insert(i);
                for (int j = i - 1; j <= i + 1; ++j) {
                    if (check(j)) s1.insert(j);
                }

            } else {
                que.push(x);
            }
        }

        while (!que.empty()) {
            // dump();

            int i = get();
            if (i == -1) break;

            int x = que.front();
            que.pop();
            ans[x - 1] = i;
        }
    }

    for (auto a : ans) std::cout << a << "\n";
}

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

    solve();

    return 0;
}