#include <bits/stdc++.h>

int32_t main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int n;
    std::cin >> n;
    std::vector<std::pair<int, int>> input(n);
    for (auto& [l, r] : input) {
        std::cin >> l >> r;
        l--;
    }

    int q;
    std::cin >> q;
    for (int i = 0; i < q; i++) {
        int x;
        std::cin >> x;
        x--;
        if (x == 0) {
            int ans = 1;
            int r = input[0].second;
            int r0 = 0;
            while (r != n) {
                int r2 = r;
                for (int& i = r0; i < r; i++) {
                    r2 = std::max(r2, input[i].second);
                }
                if (r2 == r) {
                    ans = -1;
                    break;
                }
                ans++, r = r2;
            }

            std::cout << ans << "\n";
            continue;
        } else {
            std::vector<std::vector<int>> dp(n, std::vector<int>(n + 1, n + 5));
            dp[x][x + 1] = 0;
            for (int len = 1; len < n; len++) {
                for (int l = 0; l + len <= n; l++) {
                    int r = l + len;
                    int val = dp[l][r];
                    if (val > n) {
                        continue;
                    }
                    for (int i = l; i < r; i++) {
                        int l2 = std::min(l, input[i].first);
                        int r2 = std::max(r, input[i].second);
                        dp[l2][r2] = std::min(dp[l2][r2], val + 1);
                    }
                }
            }
            if (dp[0][n] <= n) {
                std::cout << dp[0][n] << "\n";
            } else {
                std::cout << "-1\n";
            }
        }
    }

    return 0;
}