content: import java.io.*;
  import java.math.*;
  import java.security.*;
  import java.text.*;
  import java.util.*;
  import java.util.concurrent.*;
  import java.util.regex.*;
  
  public class solution {
  
      // Complete the cavityMap function below.
      static String[] cavityMap(String[] grid) {
          ArrayList<Integer> x = new ArrayList<Integer>();
          ArrayList<Integer> y = new ArrayList<Integer>();
          for (int i = 1; i < grid.length - 1; i++) {
              for (int j = 1; j < grid[i].length() - 1; j++) {
                  // store top,bottom,left and right characters
                  Character c = grid[i].charAt(j);
                  Character t = grid[i - 1].charAt(j);
                  Character b = grid[i + 1].charAt(j);
                  Character l = grid[i].charAt(j - 1);
                  Character r = grid[i].charAt(j + 1);
                  // if the character is greater than it's adjacent elements, note it's index
                  // in the new arraylist
                  if (c > t && c > b && c > l && c > r) {
                      x.add(i);
                      y.add(j);
                  }
              }
          }
          // replace those places with X in the grid
          for (int i = 0; i < x.size(); i++) {
              grid[x.get(i)] = grid[x.get(i)].substring(0, y.get(i)) + "X"
                      + grid[x.get(i)].substring(y.get(i) + 1, grid[x.get(i)].length());
          }
          return grid;
      }
  
      private static final Scanner scanner = new Scanner(System.in);
  
      public static void main(String[] args) throws IOException {
          BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));
  
          int n = scanner.nextInt();
          scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");
  
          String[] grid = new String[n];
  
          for (int i = 0; i < n; i++) {
              String gridItem = scanner.nextLine();
              grid[i] = gridItem;
          }
  
          String[] result = cavityMap(grid);
  
          for (int i = 0; i < result.length; i++) {
              bufferedWriter.write(result[i]);
  
              if (i != result.length - 1) {
                  bufferedWriter.write("\n");
              }
          }
  
          bufferedWriter.newLine();
  
          bufferedWriter.close();
  
          scanner.close();
      }
  }
  