nums=[]
num=input().split()
while num[0]!="@":
	nums.append(num)
	num=input().split()
for num in nums:
	hang=int(num[1])
	for i in range(1,hang+1):
		if i==1:
			print(" "*(hang-i),end="")
			print(num[0])
		elif i==hang:
			print(num[0]*(2*hang-1))
		else:
			print(" "*(hang-i),end="")
			print(num[0],end="")
			print(" "*(2*(i-1)-1),end="");
			print(num[0])
	print()