为什么我总是在牛与牛的游戏中得到错误的公牛数量？

import random

# 定义一副牌
deck = [f"{num}{suit}" for num in range(1, 11) for suit in ['H', 'D', 'S', 'C']]

def deal_cards():
    player_hand = random.sample(deck, 4)
    dealer_hand = random.sample(deck, 4)
    return player_hand, dealer_hand

def count_bulls_cows(player_hand, dealer_hand):
    bulls = sum(1 for p in player_hand if p in dealer_hand)
    cows = sum(min(player_hand.count(str(num)), dealer_hand.count(str(num))) for num in range(1, 11)) - bulls
    return bulls, cows

# 模拟游戏
player_hand, dealer_hand = deal_cards()
bulls, cows = count_bulls_cows(player_hand, dealer_hand)

print(f"Player Hand: {player_hand}")
print(f"Dealer Hand: {dealer_hand}")
print(f"Bulls: {bulls}, Cows: {cows}")