username="xiaoming"
age=18
hello=f'我的名字叫{username},今年{age}岁.'
print(hello)
print(username.upper())
print(len(username))
dXNlcm5hbWU9InhpYW9taW5nIgphZ2U9MTgKaGVsbG89ZifmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV9LOS7iuW5tHthZ2V95bKBLicKcHJpbnQoaGVsbG8pCnByaW50KHVzZXJuYW1lLnVwcGVyKCkpCnByaW50KGxlbih1c2VybmFtZSkpCg==