while True:
    data=str(raw_input().strip())
    if data=='@':break
    st,row=map(str,data.split())
    for i in range(int(row)):
        if i==0:
            print ' '*(int(row)-i-1)+st
        elif i==int(row)-1:
            print st*(int(row)*2-1)
        else:
            print ' '*(int(row)-i-1)+st+' '*(i*2-1)+st
    print