import java.util.*;
public class xiaowuc1 {
  public static void main(String[] args) throws Exception {
    Scanner sc = new Scanner(System.in);
    int r = sc.nextInt();
    int c = sc.nextInt();
    char[][] g = new char[r][c];
    for(int i = 0; i < r; i++) {
      String s = sc.next();
      for(int j = 0; j < c; j++) {
        g[i][j] = s.charAt(j);
      }
    }
    for(int j = 0; j < c; j++) for(int i = 0; i < r; i++) if(g[i][j] != '.') System.out.print(g[i][j]);
    System.out.println();
  }
}