输入日期（年月日），会输出当月的月历。紧接着，用户输入1或2或3 则会显示每行分别为1，2，3个月份的当年的年历。用户自己选择是否继续。-Enter the date (year, month, day), it will output the current month calendar. Then, the user inputs 1 or 2 or 3, respectively, in each row appears 1,2,3 calendar month of the year. Users choose whether to continue.