s=list(input().split())
while s[0]!="@":
    a=int(s[1])
    for i in range(1,a):
       sp=a-i
       print(" "*sp,end="")
       for j in range(1,2*i):
         if j==1 or j==2*i-1:
           print(s[0],end="")
         else:
           print(" ",end="")
       print()
    print(s[0]*(2*a-1),"\n")
    s=list(input().split())