#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <math.h>

int i, j, n, skip, len ;
char text[10001] ;

int main()
{
  while (1)
  {
    scanf("%d", &n) ;
  
    if (n == 0)
    {
      break ;
    }

    gets(text) ;

    for (i = 0, j = 0 ; text[i] ; i++)
    {
      if (text[i] != ' ')
      {
        text[j++] = text[i] ;
      }   
    }
    
    len = j ;
    text[j] = '\0' ;

    skip = (len + 1) / n ;

    if (skip != 0)
    {
      for (i = 0 ; i < skip ; i++)
      {
        for (j = i ; j < len ; j += skip)
        {
          putchar(toupper(text[j])) ;
        }
      }
    }
    else
    {
      for (i = 0 ; text[i] ; i++)
      {
        putchar(toupper(text[i])) ;
      }
    }
    printf("\n") ;
  }
    
  return 0 ;
}