#include <cstdio>
#include <cstring>
#include <cctype>

int main () {
	int N;
	char str[10000];
	int len;
	
	scanf("%d\n", &N);
	while( N ) {
		
		int new_pos, old_pos, mezera = 0;
		char *sp = gets(str);
		char *newstr;
		
		len = strlen(str);
		old_pos = 0; new_pos = 0;
		
		while( sp != NULL && *sp != '\0' ) {
			if ( *sp == ' ' || *sp == '\n' ) {
				mezera++;
			} else {
				str[new_pos-mezera] = toupper(str[new_pos]);	
			}
			new_pos++;
			sp++;
		}
		str[new_pos-mezera] = NULL;
		
//		printf("%s\n", str);
		
		len = new_pos-mezera+1;
		newstr = new char[len+1];
		memset(newstr, 0, sizeof(char)*(len) );
		
		for( int i = 0; i < len; i++ ) {
			
			new_pos = (N*i) % (len);
			while( newstr[new_pos] != 0 ) new_pos = (new_pos+1)%(len);
			//printf("%d znak %c\n ", new_pos, str[i] );
			newstr[new_pos] = str[i];
		}
		newstr[len] = NULL;
		printf("%s\n", newstr);
		delete [] newstr;
		
		scanf("%d\n", &N);
	}
}