if __name__ == "__main__":
placenames = []
with open("placenames.txt", "r") as f:
for placename in f.readlines():
if "," in placename:
new_placename = placename.split(",")[0].strip()
if new_placename not in placenames:
placenames.append(new_placename)
print(new_placename)
with open("airports.txt", "w") as f:
for placename in placenames:
f.write(placename + "\n")