#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
using namespace std;

int n, m, q, x, y;
vector <vector <int>> h;
vector <pair<int, pair<int, int>>> srt;
vector <int> p(5e5, 0);
vector <int> sz(5e5, 1);
vector <int> ind(5e5, 0);
vector <set <int>> qi(5e5);
vector <int> ans(5e5, 0);

int holvan(int a) {
    return (a == p[a] ? a : p[a] = holvan(p[a]));
}

void unio(int a, int b) {
    a = holvan(a);
    b = holvan(b);
    if (a == b) return;
    if (sz[a] < sz[b]) swap(a, b);
    p[b] = a;
    sz[a] += sz[b];

    int A = ind[a], B = ind[b];
    if (qi[A].size() < qi[B].size()) swap(A, B);
    for (int i : qi[B]) {
        if (qi[A].count(i)) ans[i] = h[x][y];
        qi[A].insert(i);
    }
    qi[B].clear();
    ind[a] = A;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> m >> q;
    h.resize(n);
    for (int i = 0; i < n; i++) {
        h[i].resize(m);
        for (int j = 0; j < m; j++) {
            cin >> h[i][j];
            srt.push_back({ h[i][j],{i,j} });
            p[i * m + j] = ind[i * m + j] = i * m + j;
        }
    }
    sort(srt.begin(), srt.end());
    for (int i = 0; i < q; i++) {
        cin >> x >> y; x--; y--;
        qi[x * m + y].insert(i);
        cin >> x >> y; x--; y--;
        qi[x * m + y].insert(i);
    }
    for (int i = 0; i < n * m; i++) {
        x = srt[i].second.first;
        y = srt[i].second.second;
        if (x && h[x][y] >= h[x - 1][y]) unio(x * m + y, (x - 1) * m + y);
        if (x < n - 1 && h[x][y] >= h[x + 1][y]) unio(x * m + y, (x + 1) * m + y);
        if (y && h[x][y] >= h[x][y - 1]) unio(x * m + y, x * m + y - 1);
        if (y < m - 1 && h[x][y] >= h[x][y + 1]) unio(x * m + y, x * m + y + 1);
    }
    for (int i = 0; i < q; i++) cout << ans[i] << endl;
}