#!/usr/bin/python
#-*-coding:utf-8 -*-
while True:
	list=raw_input().strip().split()
	if list[0]=="@":
		break
	else:
		a=list[0]
		b=int(list[1])
	for i in range(1,b+1):
		if i==1:
			print " "*(b-1)+a
		elif i==b and b!=1:
			print a*(b*2-1)
		if i!=1 and i!=b:
			print " "*(b-i)+a+" "*((i-1)*2-1)+a
	print