while True:
	a = raw_input().strip().split()
	if a[0] == '@':
		break
	else:
		n=int(a[1])
		if n == 1:
			print a[0]
			print ''
			continue;
			
		print ' '*(n-1)+a[0]
		for i in range(2,n):
			print ' '*(n-i)+a[0]+' '*(2*(i-1)-1)+a[0]
		print a[0]*(2*n-1)
		print ''