汇率与购买力平价

def solve(____):
    ppp_rate = domestic_prices / foreign_prices
    real_rate = exchange_rate * foreign_prices / domestic_prices
    deviation = (____) / ppp_rate * ____
    return {"____": domestic_prices, "____": foreign_prices, "____": exchange_rate, "____": round(____), "____": round(____), "____": round(____)}