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

int i, j, k, n, skip, len ;
char text[10001] ;
char qtext[1001] ;

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

    gets(text) ;

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

    len = j ;
    text[j] = '\0' ;
    

    for (i = 0, j = 0 , k = 0 ; i < len ; i++)
    {
      qtext[j] = toupper(text[i]) ;

      if ((j += n) >= len)
      {
        j = ++k ;
      }
    }

    qtext[len] = '\0' ;

    printf("%s\n", qtext) ;
  }
    
  return 0 ;
}