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#include<bits/stdc++.h>
bool Mbg;
using namespace std;
#define vec vector
#define pb push_back
#define eb emplace_back
#define siz(vec) (int)((vec).size())
#define all(vec) (vec).begin(),(vec).end()
template<class T>
void operator +=(vec<T> &lhs,const T &rhs){lhs.push_back(rhs);}
#define pii pair<int,int>
#define x first
#define y second
#define mp make_pair
#define exc(expr) if(expr)continue;
#define stop(expr) if(expr)break;
#define ret(expr) if(expr)return;
#define deb(var) cerr<<#var<<'='<<(var)<<"; "
#define debl(var) cerr<<#var<<'='<<(var)<<";\n"
#define ins insert
#define era erase
#define lb lower_bound
#define ub upper_bound
// #define int long long
#define inf (long long)(1e18)
template<class T>
bool Min(T &x,const T &y){return x>y?x=y,1:0;}
template<class T>
bool Max(T &x,const T &y){return x<y?x=y,1:0;}
const int mod=998244353;
void Add(int &x,const int &y){x=x+y<mod?x+y:x+y-mod;}
void Dec(int &x,const int &y){x=x>=y?x-y:x-y+mod;}
int fpm(int x,int y){
    int ans=1;for(;y;y>>=1,x=1ll*x*x%mod)if(y&1)ans=1ll*x*ans%mod;return ans;
}

int n,m,k,q;
map<int,map<int,bool> > a,del;

const int d[4][2]={1,0,0,1,-1,0,0,-1};
void sol(){
    del=a;
    queue<pii> q;
    for(auto [x,b]:a){
        for(auto [y,v]:b){
            exc(!v);
            if(!del[x-1][y]&&!del[x+1][y]||!del[x][y-1]&&!del[x][y+1]){
                q.push({x,y});
                del[x][y]=0;
            }
        }
    }
    int ans=0;
    while(!q.empty()){
        int i,j;
        tie(i,j)=q.front();
        q.pop();

        ++ans;

        for(int k=0;k<4;k++){
            int x=i+d[k][0];
            int y=j+d[k][1];
            exc(!del[x][y]);

            if(!del[x-1][y]&&!del[x+1][y]||!del[x][y-1]&&!del[x][y+1]){
                q.push({x,y});
                del[x][y]=0;
            }
        }
    }
    cout<<ans<<'\n';
}
void work(){
    cin>>n>>m>>k>>q;
    for(int i=1,x,y;i<=k;i++){
        cin>>x>>y;
        a[x][y]^=1;
    }
    sol();
    while(q--){
        int x,y;
        cin>>x>>y;
        a[x][y]^=1;
        sol();
    }
    
}
bool Med;
signed main(){
    ios::sync_with_stdio(0),
    cin.tie(0),cout.tie(0);
    int T=1;while(T--)work();
    // cerr<<"Time: "<<clock()<<" ms;\n";
    // cerr<<"Memory: "<<abs(&Med-&Mbg)/1024.0/1024.0<<" MiB.\n";
}
/*
- CONTINUE, NON-STOPPING, FOR THE FAITH
- START TYPING IF YOU DON'T KNOW WHAT TO DO
- STOP TYPING IF YOU DON'T KNOW WHAT YOU'RE DOING
*/