import datetime

def calculate_time_difference(start_time, end_time):
    # 将字符串转换为时间对象
    start = datetime.datetime.strptime(start_time, "%H:%M:%S")
    end = datetime.datetime.strptime(end_time, "%H:%M:%S")
    
    # 确保第一个时刻比第二个时刻早，如果不是则交换
    if start > end:
        start, end = end, start
    
    # 计算时间差
    time_difference = end - start
    
    # 将时间差转换为秒
    total_seconds = int(time_difference.total_seconds())
    
    return total_seconds

start_time = input()
end_time = input()

# 计算时间差
result = calculate_time_difference(start_time, end_time)

# 输出结果
print(result)

用datetime函数秒了