#!/usr/bin/python
# -*- coding: UTF-8 -*-
while True:
    a,b=map(str,raw_input().strip().split())
    row=int(b)
    if a=="@":
        break
    else:
        for i in range(1,row+1,1):
            if i==1:
                print (row-i)*" "+a
            elif i==row:
                print (2*row-1)*a
            else:
                print (row-i)*" "+a+(2*i-3)*" "+a
        print