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// Author: Olaf Surgut (surgutti)
// Created on 13-03-2025 19:15:35
#include "bits/stdc++.h"
using namespace std;

// #define int long long
#define ll long long
#define ld long double

#define endl '\n'
#define st first
#define nd second
#define pb push_back
#define eb emplace_back
#define sz(x) (int)(x).size()
#define all(x) begin(x),end(x)
#define FOR(i,l,r) for(int i=(l);i<=(r);i++)
#define ROF(i,r,l) for(int i=(r);i>=(l);i--)

auto& operator<<(auto &o, pair<auto, auto> p) {
	return o << "(" << p.st << ", " << p.nd << ")";}
auto operator<<(auto &o, auto x)->decltype(end(x), o) {
	o << "{"; int i=0; for (auto e : x) o << ","+!i++ << e;
	return o << "}";}

#ifdef LOCAL
#define debug(x...) cerr << "[" #x "]: ", [](auto...$) { \
	((cerr << $ << "; "),...) << endl; }(x)
#else
#define debug(...)
#endif

#define rep(i,a,b) for(int i = a; i < (b); i++)
using pii = pair<int, int>;
using vi = vector<int>;

const int N = 2 * 75000 + 7;
const int T = 1 << 18;

vector<pii> tree[T << 1];

void add(int l, int r, pii const& val) {
	for (l += T, r += T + 1; l < r; l >>= 1, r >>= 1) {
		if (l & 1)
			tree[l++].pb(val);
		if (r & 1)
			tree[--r].pb(val);
	}
}

vector<pair<int*, int>> hist;

void update(int* a, int b) {
	hist.eb(a, *a);
	*a = b;
}

int n, m, k, qq;

int uf[N], sz[N], sum[N];
int ans;

int get(int u) {
	return u == uf[u] ? u : get(uf[u]);
}

void dfs(int uu) {
	int old = ans;

	int czas = sz(hist);
	for (auto [u, v] : tree[uu]) {
		if (u >= 0 && v >= 0) {
			u = get(u), v = get(v);
			
			if (u != v) {
				if (sz[u] < sz[v])
					swap(u, v);
			
				if (sum[u] >= N)
					ans -= (sum[u] % N) + (sum[u] / N);
				if (sum[v] >= N)
					ans -= (sum[v] % N) + (sum[v] / N);

				update(&uf[v], u);
				update(&sz[u], sz[u] + sz[v]);
				update(&sum[u], sum[u] + sum[v]);

				if (sum[u] >= N)
					ans += (sum[u] % N) + (sum[u] / N);
			}
		}
		else {
			u = get(-u - 1);
				
			if (sum[u] >= N)
				ans -= (sum[u] % N) + (sum[u] / N);
			
			update(&sum[u], sum[u] + v);
			
			if (sum[u] >= N)
				ans += (sum[u] % N) + (sum[u] / N);
		}
	}
	
	if (uu < T) {
		dfs(uu << 1 | 0);
		dfs(uu << 1 | 1);
	}
	else {
		if (k - 1 <= uu - T && uu - T < k + qq) {
			cout << ans << '\n';
		}
	}

	while (sz(hist) > czas) {
		*hist.back().st = hist.back().nd;
		hist.pop_back();
	}

	ans = old;
}

map<pii, int> IDX, idx;

map<int, int> typ;

// 0 -> dead
// -1 -> solid
// N -> to take
// 1 -> to ignite

map<pii, int> cache;
bool test(pii p) {
	return cache.count(p) && cache[p] != 0;
}

bool is_take(pii p) {
	return (!test({p.st - 1, p.nd}) && !test({p.st + 1, p.nd})) ||
		   (!test({p.st, p.nd - 1}) && !test({p.st, p.nd + 1}));
}

bool is_square(pii p) {
	FOR(dx, -1, 0) FOR(dy, -1, 0) {
		int cnt = 0;
		FOR(a, 0, 1) FOR(b, 0, 1) {
			cnt += test({p.st + dx + a, p.nd + dy + b});
		}
		if (cnt == 4)
			return true;
	}
	return false;
}

int dist(pii a, pii b) {
	return abs(a.st - b.st) + abs(a.nd - b.nd);
}

void solve() {
	cin >> n >> m >> k >> qq;

	iota(uf, uf + k + qq, 0);
	fill(sz, sz + k + qq, 1);

	map<pii, int> edges;
	rep(i, 0, k + qq) {
		pii p;
		cin >> p.st >> p.nd;

		if (IDX.count(p) == 0) {
			IDX[p] = sz(IDX);
			typ[IDX[p]] = 0;
		}

		idx.clear();
		FOR(dx, -2, +2) FOR(dy, -2, +2) {
			pii q{p.st + dx, p.nd + dy};
			if (IDX.count(q))
				idx[q] = IDX[q];

		}

		// 3x3 cube
		vector<pii> neigh;
		FOR(dx, -1, +1) FOR(dy, -1, +1) {
			pii q{p.st + dx, p.nd + dy};
			if (idx.count(q)) {
				neigh.pb(q);
			}
		}

		cache.clear();
		FOR(dx, -2, +2) FOR(dy, -2, +2) {
			pii q{p.st + dx, p.nd + dy};
			if (idx.count(q))
				cache[q] = typ[idx[q]];
			else
				cache[q] = 0;
		}

		map<pii, int> old_cache = cache;
		
		if (cache[p] == 0)
			cache[p] = 1;
		else
			cache[p] = 0;

		for (pii q : neigh) {
			if (cache[q] == 0)
				typ[idx[q]] = 0;
			else
			if (is_take(q))
				typ[idx[q]] = N;
			else
			if (is_square(q))
				typ[idx[q]] = -1;
			else
				typ[idx[q]] = 1;
		}

		for (pii q : neigh) {
			int v = idx[q];
			
			if (old_cache[q] != typ[v]) {
				add(i, k + qq - 1, {-(v + 1), typ[v] - old_cache[q]});
			}
		}

		for (auto& [a, A] : cache)
			if (idx.count(a))
				A = typ[idx[a]];
		
		// add edges in 3x3
		for (auto [a, A] : cache) for (pii dd : vector<pii>{{0, +1}, {0, -1}, {+1, 0}, {-1, 0}}) {
			pii b{a.st + dd.st, a.nd + dd.nd};
			if (cache.count(b)) {
				int B = cache[b];
				
				if (idx.count(a) && idx.count(b)) {
					int u = idx[a];
					int v = idx[b];
					
					if (u >= v)
						continue;
					
					bool prv = (old_cache[a] > 0 && old_cache[b] > 0);
					bool nxt = (A > 0 && B > 0);

					if (prv && !nxt) {
						add(edges[{u, v}], i - 1, {u, v});
						edges.erase({u, v});
					}
					else
					if (!prv && nxt) {
						edges[{u, v}] = i;
					}
				}
			}
		}
	}

	cerr << "here\n";

	for (auto [p, i] : edges)
		add(i, k + qq - 1, p);

	cerr << "dfs\n";
	dfs(1);
}

signed main() {
	cin.tie(0)->sync_with_stdio(0);

	int tt = 1;
	// cin >> tt;
	while (tt--)
		solve();

	return 0;
}