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


int s = 0;
#define MAX 10011

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


int main(){

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

		if(cs==0)
			break;

		fgets(message,MAX,stdin);
		
		for(int  i = 0;i<strlen(message);i++){
			if(message[i]!=' ' && message[i]!='\n'){
				upg[s] = toupper(message[i]);
				s++;
			}
		}
		
		upg[s]='\0';

		int leng = strlen(upg);

		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);
	
		}

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


	return 0;
}