while True: n=list(map(str,input().split())) if n[0]=='@': break a=n[0] b=int(n[1]) for i in range(1,b+1): if i ==1: print(' '*(b-1) + a) elif i==b: print(a*(2*i-1)) else: print(' '*(b-i)+a+' '*(2*i-3)+a) print()