content: package v109;
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.StringTokenizer;
  
  
  public class LargestSquare_UVa10908 {
  
  	static int[] xLoc = new int[] {-1, -1, 1, 1};
  	static int[] yLoc = new int[] {-1, 1, 1, -1};
  	static int[] dx = new int[] {0, 1, 0, -1};
  	static int[] dy = new int[] {1, 0, -1, 0};
  
  	public static void main(String[] args) throws IOException 
  	{
  		Scanner sc = new Scanner(System.in); 
  		PrintWriter out = new PrintWriter(System.out);
  
  		int tc = sc.nextInt();
  		while(tc-->0)
  		{
  			int R = sc.nextInt(), C = sc.nextInt(), Q = sc.nextInt();
  			out.printf("%d %d %d\n", R, C, Q);
  			char[][] grid = new char[R][];
  			for(int i = 0; i < R; ++i)
  				grid[i] = sc.next().toCharArray();
  			while(Q-->0)
  			{
  				int r = sc.nextInt(), c = sc.nextInt();
  				int len = 3;
  				while(true)
  				{
  					int d = len >> 1;
  					if(r - d < 0 || r + d >= R || c - d < 0 || c + d >= C)
  						break;
  					boolean possible = true;
  					char b = grid[r][c];
  					for(int i = 0; i < 4; ++i)
  					{
  						int x = r + xLoc[i] * d, y = c + yLoc[i] * d;
  						for(int j = 0; j < len - 1; ++j)
  						{
  							int xx = x + dx[i] * j, yy = y + dy[i] *j;
  							if(grid[xx][yy] != b)
  							{
  								possible = false;
  								break;
  							}
  						}
  					}
  					if(!possible)
  						break;
  					len += 2;
  				}
  				out.println(len - 2);
  			}
  		}
  		out.flush();
  		out.close();
  	}
  
  	static class Scanner 
  	{
  		StringTokenizer st;
  		BufferedReader br;
  
  		public Scanner(InputStream s){	br = new BufferedReader(new InputStreamReader(s));}
  
  		public String next() throws IOException 
  		{
  			while (st == null || !st.hasMoreTokens()) 
  				st = new StringTokenizer(br.readLine());
  			return st.nextToken();
  		}
  
  		public int nextInt() throws IOException {return Integer.parseInt(next());}
  
  		public long nextLong() throws IOException {return Long.parseLong(next());}
  
  		public String nextLine() throws IOException {return br.readLine();}
  
  		public double nextDouble() throws IOException
  		{
  			String x = next();
  			StringBuilder sb = new StringBuilder("0");
  			double res = 0, f = 1;
  			boolean dec = false, neg = false;
  			int start = 0;
  			if(x.charAt(0) == '-')
  			{
  				neg = true;
  				start++;
  			}
  			for(int i = start; i < x.length(); i++)
  				if(x.charAt(i) == '.')
  				{
  					res = Long.parseLong(sb.toString());
  					sb = new StringBuilder("0");
  					dec = true;
  				}
  				else
  				{
  					sb.append(x.charAt(i));
  					if(dec)
  						f *= 10;
  				}
  			res += Long.parseLong(sb.toString()) / f;
  			return res * (neg?-1:1);
  		}
  
  		public boolean ready() throws IOException {return br.ready();}
  
  		public boolean nextEmpty() throws IOException
  		{
  			String s = br.readLine();
  			st = new StringTokenizer(s);
  			return s.isEmpty();
  		}
  
  
  	}
  }