source_code: 
  import java.awt.Point;
  import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.FileReader;
  import java.io.FileWriter;
  import java.util.LinkedList;
  import java.util.Queue;
  import java.util.StringTokenizer;
  
  public class FireAgain {
  
      int k, i, j,n,m,x,y;
      void run() {
          try {
              BufferedReader bfd = new BufferedReader(new FileReader("input.txt"));
              BufferedWriter out = new BufferedWriter(new FileWriter("output.txt"));
  //          BufferedReader bfd = new BufferedReader(new InputStreamReader(System.in));
              StringTokenizer tk = new StringTokenizer(bfd.readLine());
              
              n = Integer.parseInt(tk.nextToken());
              m = Integer.parseInt(tk.nextToken());
              boolean vis[][] = new boolean[n][m];
              k = Integer.parseInt(bfd.readLine());
              tk = new StringTokenizer(bfd.readLine());
              Queue<Point> q = new LinkedList<Point>();
              Point last = new Point(0,0);
              while(k-->0){
                  x = Integer.parseInt(tk.nextToken())-1;
                  y = Integer.parseInt(tk.nextToken())-1;
                  q.add(new Point(x,y));
                  vis[x][y] = true;
              }
              while(!q.isEmpty()) {
                  Point frnt = q.poll();
                  for(i=frnt.x-1;i<=frnt.x+1;++i)
                      for(j=frnt.y-1;j<=frnt.y+1;++j)
                          if(val(i,j)&& !vis[i][j]&&(frnt.x==i||frnt.y==j)){
                              q.add(new Point(i,j));
                              last = new Point(i,j);
                              vis[i][j] = true;
                          }
              }
  //          System.out.println(last.x+1 + " " +(last.y+1));
              out.write(last.x+1 + " " +(last.y+1)+"\n");
              out.flush();
              out.close();
          } catch (Exception e) {
  
          }
      }
      
      boolean val(int x,int y){
          return x>=0&&x<n&&y>=0&&y<m;
      }
      public static void main(String[] args) {
          new FireAgain().run();
      }
  
  }
  