next day问题 输入一个日期,输出这个日期的下一天 print("请输入日期:\n") year = int(input()) month = int(input()) day = int(input()) if (year <= 2100) and (year >= 1900) and (month >= 1) and (month <= 12) and (day >= 1) and (day <= 31): if ((month == 1) or (month == 3)<