import java.util.*;
public class Main {
    public static void main (String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        if(s.length() == 0 || s.length()>50 || !s.matches("[a-zA-Z]+")){
            System.out.println("Invalid Input");
            return;
        }
        int n = s.length();
        for (int i = 0 ; i < n  ;i++){
            for (int j = 0;j<n;j++){
                if(j== i || j == n -1 - i){
                    System.out.print(s.charAt(i));
                }
                else
                {
                    System.out.print(" ");
                }
                System.out.println();
                }
            }
        }