from pathlib import Path

txt1 = Path('E:/')  / "basic.txt"
txt2 = Path('E:/')  / "bad.txt"

with txt1.open("r", encoding="utf-8") as f:
    titles1 = [line.strip() for line in f if line.strip()]

with txt2.open("r", encoding="utf-8") as f:
    titles2 = [line.strip() for line in f if line.strip()]

result = []
for title in titles1:
    if title not in titles2:
        result.append(title)

txt3 = Path('E:/')  / "good.txt"
with txt3.open("r", encoding="utf-8") as f:
    titles3 = [line.strip() for line in f if line.strip()]

result_new = []
for title in result:
    if title in titles3:
        result_new.append(title)
print(result_new)