First, use SSTV decoder to decode the audio to an image. This image has a `rot13` flag on the top left.
```py# Tool used: SSTV decoder - Android # The flag is in the imagetext = 'QHPGS{UHZOYR_Z3Z3_1BEQ}'
def rot13(text):    rot = ''    for i in text:        if i.isalpha():            rot += chr((ord(i) - ord('A') - 13) % 26 + ord('A'))        else:            rot += i    return rot
flag = rot13(text)
print(flag)
# DUCTF{HUMBLE_M3M3_1ORD}```