# CheckIn
## How to Setup Environment
move `challenge.yml` to your repository `.github/workflows/challenge.yml
## Write Up
1. GitHub masks secrets when they are printed to the console like `***`2. the flag is just a few numbers
just make a script to generate payload and it also can prevent others get the flag from your issue
```python
import randoma=[False for i in range(1000000)]payload = "01234"count = 1while True:    n = random.choice("0123456789")    now = payload[-4:] + n    if not a[int(now)]:        payload+=n        count+=1    if count %100 == 0 :        print(f"process :{count}/99999,payload length: {len(payload)}")        with open("payload.txt","w") as f:            f.write(payload)    if count == 99999:        print("finish")        break```