CF724A Checking the Calendar

您将得到一周中某两天的英文名。 请判断是否有可能在某个非闰年期间，某个月的第一天为给出的第一天，下个月的第一天为给出的第二天。这两个月应属于同一年。 本题中，我们将使用公历，即一年有12个月，每个月的天数分别为： _31,28,31,30,31,30,31,31,30,31,30,31_ 。 给出的日期名称将以小写英文单词给出，即为: _"monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"_ 。

两行。

如果可能，请输出 _"YES"_ （不加引号），否则输出 _"NO"_ （不加引号）。

In the second sample, one can consider February 1 and March 1 of year 2015. Both these days were Sundays. In the third sample, one can consider July 1 and August 1 of year 2017. First of these two days is Saturday, while the second one is Tuesday.