[Python] Script to Use Virustotal to Convert SHA256 to MD5

I sometimes get a huge list of SHA256 hashes that I need the MD5 version of. VirustTotal contains this information but doing 200+ manually is not really feasible. I have a script cobbled together from internet sleuthing that feels like it should work, but I only get back an empty file. The goal is to take an input file that is only a list of SHA256 hashes, and output a text file that is only a list of the corresponding MD5 hashes. What am I missing?

import requests
import sys
import time
import json

url = 'https://www.virustotal.com/api/v3/files/{}'
headers = {"accept": "application/json",
"x-apikey": "<key>"}

inf = input("What hash file?")

with open(inf, "r") as f:
with open("hashout.txt", "w") as output:
for line in f:
HASH = str(line).strip()
url = url.format("HASH")
response = requests.get(url, headers=headers)
data = response.json()
md5 = data["md5"]
output.write(md5)
time.sleep(16) # VirusTotal Public API allows only 4 requests per minute, sleep to avoid hitting this
print("File Complete")

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