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



using namespace std;
int main(){
	int MAX_LENGTH = 10000;
	int len;
	char line[MAX_LENGTH]; 
	char toReturn[MAX_LENGTH];
	int n,k;
	int i = 0;
	
	while(true){

	i = 0;
	
	for(int b = 0; b < 10000;b++){
	line[b] = ' '; 
	toReturn[b] = '\0';
	}
	toReturn[100] = '\0';

	scanf("%d",&n);	
	if(n == 0){
		break;
	}
	scanf("%c",line);
		
	while(true){
	scanf("%c",line +i);
	if(line[i] == '\n'){
	line[i] = '\0';
	break;

	}
	
	i++;
	}


	len = strlen(line);
	for(int i = 0; i < len;i++){

		if(line[i] == ' '){
			for(int j = i;j< len; j++){
				line[j] = line[j+1];

			}
			len--;
		}
		line[i] = toupper(line[i]);
	}

	len = strlen(line);


	
	for(int i = 0;i<len;i++){
	toReturn[i] = ' ';
	}
	toReturn[0] = line[0];
	
	k=0;
	for(int j = 0; j < n;j++){
		for(int i = 0;n*i+j < len; i++){
			toReturn[n*i+j] = line[k];
			k++;
			//cout << toReturn << endl;
		}
	}
	
	toReturn[len] = '\0';

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

}


	return 0;
}