The biannual THUPC has arrived once again, and Xiao Z has brought out his traditional skill—the final, elaborate "check-in" problem. In previous years, check-in problems were always solved by contestants immediately after the start. This time, however, Xiao Z decided to do something different: "Wouldn't it be fun if I deliberately made the check-in problem cryptic, making the contestants scratch their heads for even a little while at the start?"

He acted immediately, meticulously designing a flashy set of misdirections. Looking at the final product, Xiao Z was filled with pride. He even began to imagine the scene shortly after the start: contestants staring at the problem with no clue, the venue in dead silence, and the leaderboard completely stagnant...

With this joy of a bountiful harvest, Xiao Z arrived at the competition venue on the day of the event. However, as the starting signal sounded, whispers began to rise throughout the venue. Xiao Z walked up to the contestants, only to hear that the tone and emotion of their discussions were by no means what one would expect from a normal problem discussion; many people couldn't even help but laugh out loud.

"Strange, did something go wrong with my problem?" Xiao Z puzzledly opened the leaderboard, only to see the number of people passing the problem rising rapidly, much faster than any previous check-in problem! "No, this is impossible!" Xiao Z's hands trembled as he clicked on the problem, switching back and forth between various pages. Suddenly, the content that caught his eye made him freeze instantly.

Yes, you guessed it right: Xiao Z had made a serious error in the problem-setting process, allowing contestants to pass the problem with ease! Xiao Z, slightly recovering from the shock of discovering his mistake, decided to immediately set about fixing it. However, after calm reflection, Xiao Z suddenly realized a devastating fact: he had committed an irreparable error!

Frankly speaking, errors in problems are not uncommon in competitions. Most common errors, such as those involving the problem statement, test data, or judging configuration, can be remedied by timely fixes during the contest to minimize losses. However, Xiao Z's error hit the most fatal point: the contestants had already obtained information they should not have had, enough to allow them to pass the problem easily. At this point, it was too late; no amount of effort could cover up the fact that Xiao Z had made a huge mess.

"Ah~" Xiao Z felt the world spinning and nearly fainted.

Everything that happened afterward, and how this mess was handled, has become blurred in Xiao Z's memory. To this day, the details of this legendary story have long been lost. After a long period of silence, Xiao Z finally decided to reflect on his mistakes, artistically process this past event, and tell it to the world as a warning.

Input

Read data from standard input.

There is no input.

Output

Output to standard output.

Output the content that this problem should output. Please note that the output for this problem is unique and deterministic.

Note

Because this problem requires a direct output of the answer, the sample output can pass this problem directly; therefore, the sample is not rendered in the problem statement.

Staff members, please check carefully before the contest and do not accidentally distribute the sample to the contestants.