#include <iostream>
#include <stdio.h>
#include <cctype>

using namespace std;
int main(){
	int N;
	int i,j,k;
	char Vstup[10005];
	char Vystup[10005];
	char znak;
	scanf("%i\n", &N);
	if ( N == 0 ) {
		return 0;
	}

	do {
		i = 0;
		while ((znak=getchar()) != '\n'){
			if (znak == ' ')
			      continue;
			Vstup[i] = toupper(znak);
			i++;	
		}
		
		j = 0;
		int count = 0;
		int index = 0;
		while((j=index) < i){
			for(k = count; k < i;){
				Vystup[k] = Vstup[index];
				index++;
				k+=N;
			}
			count++;
		}
		
		for (j = 0; j < i; j++){
			printf("%c",Vystup[j]);
		}
		cout << '\n';
		scanf("%i\n", &N);
	} while (N != 0);
	return 0;
}