#include <iostream>
#include <sstream>

using namespace std;

int main(int argc, char *argv[]) {

	while (1) {
		int N;
		std::string t;
		getline(cin, t);
		stringstream ss(t);
		ss >> N;
		if (N==0) break;
		getline(cin, t);
		string o;
		for (int i = 0; i<t.length(); ++i) {
			if (t[i]==' ') continue;
			if (t[i]>='a')
				o += 'A'+t[i]-'a';
			else
				o += t[i];
		}
		string o2;
		if (N < o.length()) {
			o2.insert(0, o.length(), ' ');
			int p = 0;
			for (int i = 0; i < N; ++i) {
				for (int j = 0; j < o.length() ; j += N) {
					o2[j+i] = o[p];
					++ p;
				}
			}
		} else
			o2 = o;
		//cout << N << " '" << o2 << "'" << endl;
		cout << o2 << endl;
	}

	return 0;
}