Simple python application to decode base64, just run and input any base64 string.

b64decode.py

import base64

def base64_decode(strg):
	res = base64.urlsafe_b64decode(strg + '=' * (-len(strg) % 4))
	print(str(res.decode('utf-8')))
	print("")

while True:
	strg = input()
	if strg == "exit":
		break
	print("")
	base64_decode(strg)