while True:
	a=map(str,raw_input().strip().split())
	if a[0]=="@":
		break
	else:
		n=int(a[1])
		if n==1:
			print a[0]*(2*n-1)+"\n"
		else:
			print " "*(n-1)+a[0]
			for i in range(n-2,0,-1):
				print " "*i+a[0]+" "*(2*n-3-i-i)+a[0]
			print a[0]*(2*n-1)+"\n"