while True:
	n=map(str,raw_input().strip().split())
	if n[0] == '@':
		break
	x=n[0]
	y=int(n[1])
	for j in range(1,y+1):
		if j==1:
			print ' '*(y-1)+x
		elif j==y:
			print x*(2*y-1)
		else:
			print ' '*(y-j)+x+' '*(2*j-3)+x
	print