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

int main() {
int pocet,sifra;
char *slovo;//[10000];
slovo=(char*)malloc(sizeof(char)*10001);
char *slovo2;//[10000];
slovo2=(char*)malloc(sizeof(char)*10001);
int i = 0,j = 0,m=0;
int posun = 0;
while (1) {
scanf("%d\n",&sifra);
slovo[0]='\0';
slovo2[0]='\0';
if (sifra==0) return 0;
	do {
	scanf("%s",slovo+strlen(slovo));
	}
	while ('\n' != getchar());

if (sifra>strlen(slovo)) {
	for (i=0;i<strlen(slovo);i++) {
	slovo[i] = (slovo[i] >= 'a' && slovo[i] <= 'z') ? slovo[i] - ('a' - 'A') : slovo[i];
	}
	printf("%s\n",slovo);
	continue;	
}

	posun = (strlen(slovo) / sifra) + 1;

	j=0;
	int pom=0;
	for (i=0;i<strlen(slovo);i++)  {
		slovo2[i]=slovo[j];
		j+=posun;			
		if (j>=strlen(slovo)) {
			pom++;			
			j=pom;
		}
	}
	slovo2[i]='\0';

for (i=0;i<strlen(slovo2);i++) {
	slovo2[i] = (slovo2[i] >= 'a' && slovo2[i] <= 'z') ? slovo2[i] - ('a' - 'A') : slovo2[i];
}

printf("%s\n",slovo2);

}


return 0;
}