#include <stdio.h>

int main(){

	unsigned int n = 5;
	int i=1;
	int j=1;




	while(i<=n){
		while (j<=n){
			if (j == i  || j + i == n+1 ){
				printf("O ");

			}
			else{

				printf("X ");
			}
			j++;

		}

		i++;

		printf("\n");
		j = 1;
	}


}