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#include <stdio.h>

/*  *****
	*   *
	*   *
	*   *
	*****    */

int main(){
    int n;
    printf("enter ");
    scanf("%d",&n);
    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            if(i==0 || j==0 || i==n-1 || j==n-1){
                printf("*");
            }
            else{
                printf(" ");
            }
        }
        printf("\n");
    }
    return 0;
}
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