// editor3
#include<stdio.h>
int main(){
    int n;
    scanf("%d", &n);
    if(n<=0||n%2==0){
        printf("Invalid input");
        return 0;
    }
    int main =n/2;
    for (int i=0;i<n;i++){
        for (int j=0;j<n;j++){
            if(i==mid||j==mid)
            printf("*");
            else
            printf(".");
        }
        printf("\n");
    }
    return 0;
}