统计资金净流出最大的账户

def solve():
    from pyodide.http import open_url
    customers_csv = open_url(____).read()
    accounts_csv = open_url(____).read()
    cards_csv = open_url(____).read()
    transactions_csv = open_url(____).read()
    transfers_csv = open_url(____).read()
    import sqlite3
    import pandas as pd
    from io import StringIO

    conn = sqlite3.connect(____)
    pd.read_csv(StringIO(____)).to_sql(____)
    pd.read_csv(StringIO(____)).to_sql(____)

    result = pd.read_sql_query(____)
    print(result.to_string(____))
    conn.close()