username="xiaoming"
age=18
aa=f"我的名字叫{username},今年{age}岁."
print(aa)
print (username.upper())
print (len(username))
dXNlcm5hbWU9InhpYW9taW5nIgphZ2U9MTgKYWE9ZiLmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV9LOS7iuW5tHthZ2V95bKBLiIKcHJpbnQoYWEpCnByaW50ICh1c2VybmFtZS51cHBlcigpKQpwcmludCAobGVuKHVzZXJuYW1lKSk=