> [name=FlyDragon]

## Step.1
The file is a gif


## Step.2
Extract every frame


## Step.3
You can know it is morse code by the hint and the describtion (1836、Classic cryptography)

■-->'-' ●-->'.' ▲-->' '

Use [Online tool](https://morsecode.world/international/translator.html) to obtain the flag


{%hackmd M1bgOPoiQbmM0JRHWaYA1g %}