username='liyingmei'
age=18
hello=f'我的名字叫{username},今年{age}岁'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWU9J2xpeWluZ21laScKYWdlPTE4CmhlbGxvPWYn5oiR55qE5ZCN5a2X5Y+re3VzZXJuYW1lfSzku4rlubR7YWdlfeWygScKcHJpbnQoaGVsbG8pCnByaW50KHVzZXJuYW1lLnVwcGVyKCkpCnByaW50KGxlbih1c2VybmFtZSkp