username="xiaoming"
age=18
aa=f"我的名字叫{username}今年{age}岁"
print(aa)
print(username.upper())
print(len(username))
dXNlcm5hbWU9InhpYW9taW5nIgphZ2U9MTgKYWE9ZiLmiJHnmoTlkI3lrZflj6t7dXNlcm5hbWV95LuK5bm0e2FnZX3lsoEiCnByaW50KGFhKQpwcmludCh1c2VybmFtZS51cHBlcigpKQpwcmludChsZW4odXNlcm5hbWUpKQ==