```
import pickle

data = pickle.load(open('./data', 'rb'), encoding='ASCII')

print(data[1] + data[2] + data[3], end='')

for i in range(4, 23):
print(chr(data[i]), end='')

print(data[23])

# DUCTF{p1ckl3_y0uR_m3554g3}
```