请问输出该如何把末尾的＃删去呢

a = input(">>>")
anew = a.swapcase()
print(anew[:-1])
'''--result
>>>asdkjULHaaf  werw#
ASDKJulhAAF  WERW
'''

str1 = "666#"
str2 = str1.rstrip("#")
print(str2)  # 666