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


using namespace std;

int main() {
	char * text = (char*)malloc(10101*sizeof(char));
	char * filtered = (char*)malloc(10101*sizeof(char));
	int step;
	char c;
//	string text;
//	string filtered;

	while(1) {

//		for (int i = 0; i < 10000; ++i) text[i] = 0;
		
		//cin >> step;

		//if (!step) break;

		//cin >>	text;

//		text = replaceAll(text, " ", "");
		
		scanf("%d", &step);
		if (step==0) break;
		scanf("%c",&c);
		
		text = gets(text);

//		scanf("%s",text);

//		int x=0;
//		while(text[x])printf("%x ",text[x++]);
//		printf("\n");

		int i=0, len = 0;
		while(text[i]) {
			if (text[i]!=' ' && text[i]!='\n'){
				if (text[i]>='a' && text[i]<='z') text[i]-= 'a'-'A';
				filtered[len]=text[i];
				++len;
			}
			++i;
		}
		filtered[len]=0;
//		cout << text;

		int pos;
		int krok= len/step;
		if (len%step > 0){
			++krok;
		}

		for (i = 0; i < len/step+1; ++i) {
			pos = i;
			while(pos < len) {
				printf("%c", filtered[pos]);
				//text += filtered[pos];								
				pos += krok;
			}
		}

		printf("\n");

	}

	

	free( text);
	free(filtered);

	return 0;
}