def compare_strings(str1, str2):
    # 清理字符串：去除首尾空白，按换行分割后去除每行空白，按逗号分割
    list1 = [item.strip() for item in str1.strip().split('\n') if item.strip()]
    list1 = [sub_item.strip() for item in list1 for sub_item in item.split(',') if sub_item.strip()]
    list2 = [item.strip() for item in str2.strip().split('\n') if item.strip()]
    list2 = [sub_item.strip() for item in list2 for sub_item in item.split(',') if sub_item.strip()]

    # 找出差异
    diff1 = [item for item in list1 if item not in list2]  # str1 比 str2 多的元素
    diff2 = [item for item in list2 if item not in list1]  # str2 比 str1 多的元素

    # 构建输出
    result = []
    if diff1:
        result.append(f"第一个字符串比第二个字符串多了 {len(diff1)} 个元素：")
        result.extend(diff1)  # 每个元素占一行
    if diff2:
        result.append(f"第二个字符串比第一个字符串多了 {len(diff2)} 个元素：")
        result.extend(diff2)  # 每个元素占一行

    # 返回结果
    return '\n'.join(result) if result else "两个字符串相同"


# 从文件读取数据
try:
    with open('str1.txt', 'r', encoding='utf-8') as f:
        str1 = f.read()
    with open('str2.txt', 'r', encoding='utf-8') as f:
        str2 = f.read()

    # 运行比较
    print(compare_strings(str1, str2))

except FileNotFoundError as e:
    print(f"错误：找不到文件 {e.filename}")
except Exception as e:
    print(f"发生错误：{str(e)}")