#include <iostream>
#include <stdio.h>
#include <string.h>
#include <vector>
#include <stdlib.h>
#include <algorithm>
#include <ctype.h>


using namespace std;
#define MAX_LEN 10001
const int max = 10001;

int main()
{
char zdrojovytext[MAX_LEN];
char *textsmezery = new char[MAX_LEN];
char *bezmezer = new char[MAX_LEN];
int num;

while(cin >> num && num !=NULL)
{
int delbezmezer= 0;
	cin.get();
	cin.getline(zdrojovytext,MAX_LEN);
	int delkamezery = strlen(zdrojovytext);
	int k=0,r=0;
	while (zdrojovytext[k++])
	{
		if(zdrojovytext[k-1] !=' ')
{
			bezmezer[r++] = toupper(zdrojovytext[k-1]);
delbezmezer++;
}

	}	
/*
if(num >delbezmezer)
{
	
}*/
	if(num > delkamezery)
{
	cout << bezmezer<<endl;
	//delbezmezer += (num - delbezmezer-1); 
}
else
{

	for (int o=0;o<delbezmezer;o++)
	{
			textsmezery [(o*num)%delbezmezer] = bezmezer[o];  
	}	

cout <<textsmezery<<endl;
}
	bezmezer = new char[MAX_LEN];
	textsmezery  = new char[MAX_LEN];


}
/*
	char ss[MAX_LEN];
	char pom[MAX_LEN];
	char mess2[MAX_LEN];
	int num;
int delka;
	cin >> num;
	while((cin >> pom ))
	{
		
			if (pom [0] >= '0' && pom[0] <= '9')
			{
				delka = strlen(ss);
				//konverze
					for (int i=0;i<delka;i++)
					{
						mess2[i*num/delka] = ss[i];  		
					}			
				//vypis
				cout << mess2 << endl;


					num=atoi(pom);
			
			}
			if (pom [0] == '0' && strlen(pom)== 1)
			{
				break;
			}

		strcat(ss,pom);
		
	
	}*/
	return 0;
}
/*
	char c;
	
	int num;
	int delka;
	int konec = 10000;
	int poradi; 
	scanf("%d",&num);getchar();
	cin.getline(mess,MAX_LEN);
		
	delka = mess.length();
	poradi=0;
	for (int i=0;i<delka;i++)
	{
		if (mess[i]== ' ')
		{
			continue;
		}		
		mess2[poradi*2/delka] = mess[i];  		
		poradi++;
	}
	cout << mess2;
*/