#include <stdio.h>

int main( )
{
    char c;
    int i, n;

   
    while (scanf("%c %d",&c,&n))
    {   i=0;
        if(c=='@')
        break;
        printf("%*c\n",n,c);
        if (n==1)
        {
            i=1;
            continue;
        }
        
        for (i=1; i+1<n; i++)
        {printf("%*c%*c\n",n-i,c,i*2,c);}
   
        for (i=0;i<2*n-1; i++)
    printf("%c",c);
            putchar('\n');
    }
    return 0;}