#include "stdio.h"
#include "string.h"
#include "memory.h"

#define MAX 10000

int main()
{
	int cnt,len, enc, posun=0;

	while(true)
	{	
		scanf("%d ", &enc);
		
		if (enc==0)	
			break;

		char pole[MAX];
		int k=0; char c = -1;
		while (c!='\n')
		{
			scanf("%c", &c);
			if (c != ' ' && c!='\n')
			{
				pole[k]=(c <= 'z' && c>='a')?(c-('a'-'A')):c;
				k++;
			}
		}

		//printf("%s\n\n", pole);

		len = strlen(pole);
		cnt=0;
		int maxy=len/enc+1;

		char vystup[enc][maxy];
		memset(vystup, 0, enc*maxy);
		
		int i=0;

		//printf("%d %d", enc, maxy);

		for (int x=0; x<enc; x++)
			for (int y=0; y<maxy; y++)
				{
					vystup[y][x] = pole[i];
					i++;
				}

		for (int y=0; y<maxy; y++)
			for (int x=0; x<enc; x++)
				printf("%c", vystup[y][x]);

		printf("\n");
	}

	return 0;
}