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