#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <iostream>

using namespace std;
int cs =0;
int s = 0;
#define MAX 10011

char message[MAX];
char upg[MAX];
char result[MAX];


int main(){


char c;

	while(1){
		s=0;
	
		scanf("%d\n",&cs);

		if(cs==0)
			break;
		
		//fgets(message,MAX,stdin);
			//message=cin.getline();

		int i = 0;
		do {
			c = getchar();
			if (c != '\n')
			{ 
				message[i] = c;
				i++;
			}else if(c=='\n')
				break;
		}while(1);

		for(int  i = 0;i<strlen(message);i++){
			if(message[i]!=' ' /* message[i]!='\n'*/){
				upg[s] = toupper(message[i]);
				s++;
			}
		}
		//printf("%s\n",upg);
		//upg[s]='\0';

		int leng = strlen(upg);
		if(leng%2!=0)
			leng++;
		//printf("%d",leng);

		if(leng/cs == 0){
			printf("%s\n",upg);
		}else{
		
		
		for(int i=0;i<cs;i++){
			for(int j=0;j<leng/cs;j++){
				
				result[j*cs+i]=upg[j+i*(leng/cs)];
		}
		}
		

		printf("%s\n",result);
	
		}

		

		int hl = 0;

		/*for(int x = 0;<leng/cs;x++){
			result[x*cs]=

		}*/

			for(int i =0;i<leng;i++){
				result[i]='\0';
				upg[i]='\0';
				message[i]='\0';
			}	
		
	
		}


	return 0;
}