import java.util.Scanner;

public class Task17 {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int b;
        char c;
        do{
            System.out.print("(length) b = ");
            b = scan.nextInt();
            System.out.print("(inner symbol) c = ");
            c = scan.next().charAt(0);
        }while(b<3 || b>20);

        for(int row=1; row<=b; row++){

            if(row==1 || row==b){
                //first and last rows
                for(int i=0; i<b;i++){
                    System.out.print("* ");
                }
                System.out.println();
            }else{
                for(int col=1; col<=b; col++){

                    if(col==1 || col==b){
                        //first and last columns
                        System.out.print("* ");
                    }else
                        System.out.print(c+" ");
                }
                System.out.println();
            }
        }

    }

}