#! -*- coding: UTF-8 -*-
while True:  
	a = map(str, raw_input().strip().split())  
	if a[0] == '@':
		break 
	a[1]=int(a[1])
	if a[1]==1:
		print a[0]
	else:
		print ' '*(a[1]-1)+a[0]
		for i in range(a[1]-2):
			print ' '*(a[1]-i-2)+a[0]+' '*((i+1)*2-1)+a[0]
		print a[0]*(a[1]*2-1)
	print