import sqlite3

def danger_word(input_word)
dangerous=['union','select']
for key_word in dangerous:
    if key_word.lower() in dangerous.lower(): 
        return None
return input_word

def filter(username,password):
        filter_user=danger_word(username)
        filter_password=danger_word(password)
        if filter_user is None or filter_password is None:
            return " nonon"

conn=sqlite3.connect(database.db)
cursor=conn.cursor()
sql=f"SELECT * FROM users WHERE user='{filter_user}' AND password='{filter_password}'"
cursor.execute(sql)
result=cursor.fetchone()
conn.close()
if result:
    return "success"
else:
    return "nonon"