s=input()
while s!="@":
    s=s.split()
    ch=s[0]
    n=int(s[1])
    print(" "*(n-1)+ch)
    i=n-2
    while i>=1:
        print(" "*i+ch+" "*((n-i-1)*2-1)+ch)
        i-=1
    if n>1:print(ch*(n*2-1))
    print()
    s=input()