#include <iostream>
using namespace std;

int main()
{
	int x = 9999;
	char a;	
	int n;
	char *A=NULL;
	A = new char[x];
	int *N = NULL;
	N = new int[x];

	int k;
	for (k=0;;++k)
	{
		cin >> A[k] ;
		if (A[k] == '@') break;
		cin >>N[k];
	}


	for(int i=0;i<k;++i)
	{ 
		a = A[i];
		n = N[i];
		char**p = new char*[n];
		for (int i = 0; i < n; ++i)
		{
			p[i] = new char[2 * n - 1];
			for (int t = 0; t < 2 * n - 1; ++t)
			{
				p[i][t] = ' ';
			}
		}

		for (int i = 0; i < n; ++i)
		{
			if (i == 0)  //第一行
			{
				p[0][n - 1] = a;
			}

			else if (i == n - 1)  //最後一行
			{
				for (int j = 0; j < i + 1; ++j)
				{
					p[n - 1][j] = a;
					p[n - 1][2 * n - 1 - j] = a;
				}
			}

			else  //中間
			{
				p[i][n - 1 - i] = a;
				p[i][n - 1 + i] = a;
			}
		}
		for (int i = 0; i < n; ++i)  //顯示輸出
		{
			for (int t = 0; t < 2 * n - 1; ++t)
			{
				cout << p[i][t];
			}
			if(i!=n-1)cout << endl;
		}
		if(i!=k-1)cout << endl<<endl;
	}
	
}