#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
int n,ans,m,sx,sy,tx,ty,flag;
typedef pair<int,int> PII;
const int N = 1100;
char g[N][N];
int vis[N][N];
int dx[] = {1,-1,0,0};
int dy[] = {0,0,1,-1};


int bfs(int x,int y){
	queue<PII> q;
	q.push({x,y});
	vis[x][y] = 1;
	while(q.size()){
		auto cur = q.front();
		q.pop();
		
		int x=cur.first,y=cur.second;
		for(int i=0;i<4;i++){
			int nx=x+dx[i],ny=y+dy[i];
			if(nx>=0&&nx<n&&ny>=0&&ny<n&&!vis[nx][ny]&&g[nx][ny] != g[x][y]){
				ans++;
				q.push({nx,ny});
				vis[nx][ny] = 1;
			}
		}
	}
	
}


int main()
{
    ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    cin>>n>>m;
    for(int i=0;i<n;i++){
    	for(int j=0;j<n;j++){
    		cin>>g[i][j];
		}
	}
	while(m--){
		int i,j;cin>>i>>j;
		i--,j--;
		
		ans = 1;
		memset(vis,0,sizeof vis);
		bfs(i,j);
		cout << ans << endl;
	}
    return 0;
}