#include <cstdio>
#include <iostream>
#include <algorithm>
#include <vector>
#include <cmath>
#include <cstring>
#include <map>
#include <set>
using namespace std;

#define EPS 1e-12

int main() {
	int n;
	scanf("%d\n", &n);
	while (n) {
		char str[10042];
		gets(str);
		char *s = str;
		char ss[10042];
		int len = 0;
		while (s[0]) {
			if (s[0] != ' ') {
				if (s[0] >= 'a' && s[0] <= 'z') {
					ss[len++] = s[0] - ('a'-'A');
				} else {
					ss[len++] = s[0];
				}
			}
			++s;
		}
		ss[len] = 0;
		//printf("-%s-\n", ss);
		char c[10042];
		c[len] = 0;
		int start = 0;
		int pos = 1234567890;
		for (int i = 0; i < len; ++i) {
			pos += n;
			if (pos >= len) {
				pos = start++;
			}
			c[pos] = ss[i];
		}
		printf("%s\n", c);
		scanf("%d\n", &n);
	}
}