username='xiaoming'
age=18
tt=f'我的名字叫{username},今年{age}岁'
print(tt)
print(username.upper())
print(len(username))
dXNlcm5hbWU9J3hpYW9taW5nJwphZ2U9MTgKdHQ9ZifmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV9LOS7iuW5tHthZ2V95bKBJyAgIApwcmludCh0dCkKcHJpbnQodXNlcm5hbWUudXBwZXIoKSkKcHJpbnQobGVuKHVzZXJuYW1lKSk=