I'Ve a directory that includes some files in this format: "01-first-name-second.flac" I

Question

I'Ve a directory that includes some files in this format: "01-first-name-second.flac" I

wanna rename them all so the name would only only include the "name" section. I tried the code below:
import os
for filename in os.listdir('.'):
parts = filename.split('-')
new_name = parts[2] + '.flac'
os.rename(filename, new_name)
but it gives me an error: index out of range. What should I do?