#include <stdio.h>
#include <stdlib.h>
struct a
{
	char *b = NULL;
} x;
int main()
{
	
	int razmer = 0;
	scanf("%i ", &razmer);
	razmer = razmer + 5;
	x.b = (char*)calloc(razmer, sizeof(char));
	for (int a = 0; a < razmer; a++)
	{
		for (int i = 0; i < 5; i++)
		{
			scanf("%c", &x.b[i][a]);
		}
	}
	for (int a = 0; a < razmer; a++)
	{
		for (int i = 0; i < 5; i++)
		{
			printf("%c", x.b[i][a]);
		}
	}
	return 0;
}