while True:
  try:
   s=input()
   if s[0]=="@":
        break
   s=s.split()
   # print(s)
   ch,n=s
   n=int(n)
   # print(ch," ",n)
   print(" "*(n-1),ch,sep="")
   for i in range(1,n-1):
       print(" "*(n-i-1),ch," "*(2*i-1),ch,sep="")
   if n!=1 :
       print(ch*(2*n-1),sep="")
   print()
  except EOFError:
      break