while True:
	numbers = map(str,raw_input().strip().split())			
	if numbers[0]=="@":
		break
	else:
		i=1
		while i<len(numbers):
			j=2
			if int(numbers[i])>1:
				print " "*(int(numbers[i])-1)+numbers[i-1]
				while j<int(numbers[i]):
					print " "*(int(numbers[i])-j)+numbers[i-1]+" "*(2*j-3)+numbers[i-1]
					j+=1
			print numbers[i-1]*	(int(numbers[i])*2-1)	
			i+=2
			print