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