#include <iostream>
#include <cstring>
using namespace std;
int main()
{
	int n,i,j;
	char message[201],ch;
	while(cin >> n && n != 0){
		cin >> message;
		int length = strlen(message);
		for(i = n;i < length;i += n * 2)
			for(j = i;j < (n * 1.0 / 2 + i);j++){
				ch = message[j];
				message[j] = message[2 * i - 1 + n - j];
				message[2 * i - 1 + n - j] = ch;
			}
		j= 1;
		for(i = 0;i <= 201;i += n){
			if(i >= length)
				i = j++;
			cout << message[i];
			if(i == length - 1)
				break;
		}
		cout << endl;
	}
	return 0;
}