Voting
Contest: Codeforces Round 388 (Div. 2)
Difficulty rating: 1500
Tags: greedy, implementation, two pointers

There are n employees in Alternative Cake Manufacturing (ACM). They are now voting on some very important question and the leading world media are trying to predict the outcome of the vote.

Each of the employees belongs to one of two fractions: depublicans or remocrats, and these two fractions have opposite opinions on what should be the outcome of the vote. The voting procedure is rather complicated:

1. Each of n employees makes a statement. They make statements one by one starting from employees 1 and finishing with employee n. If at the moment when it's time for the i-th employee to make a statement he no longer has the right to vote, he just skips his turn (and no longer takes part in this voting).
2. When employee makes a statement, he can do nothing or declare that one of the other employees no longer has a right to vote. It's allowed to deny from voting people who already made the statement or people who are only waiting to do so. If someone is denied from voting he no longer participates in the voting till the very end.
3. When all employees are done with their statements, the procedure repeats: again, each employees starting from 1 and finishing with n who are still eligible to vote make their statements.
4. The process repeats until there is only one employee eligible to vote remaining and he determines the outcome of the whole voting. Of course, he votes for the decision suitable for his fraction.

You know the order employees are going to vote and that they behave optimal (and they also know the order and who belongs to which fraction). Predict the outcome of the vote.

Input format:
The first line of the input contains a single integer n (1 ≤ n ≤ 200 000) — the number of employees.

The next line contains n characters. The i-th character is 'D' if the i-th employee is from depublicans fraction or 'R' if he is from remocrats.

Output format:
Print 'D' if the outcome of the vote will be suitable for depublicans and 'R' if remocrats will win.

Constraints:
Time limit: 1.0 s
Memory limit: 256.0 MB

Note:
Consider one of the voting scenarios for the first sample:

1. Employee 1 denies employee 5 to vote.
2. Employee 2 denies employee 3 to vote.
3. Employee 3 has no right to vote and skips his turn (he was denied by employee 2).
4. Employee 4 denies employee 2 to vote.
5. Employee 5 has no right to vote and skips his turn (he was denied by employee 1).
6. Employee 1 denies employee 4.
7. Only employee 1 now has the right to vote so the voting ends with the victory of depublicans.

Example input:
5
DDRRR

Example output:
D

Example input:
6
DDRRRR

Example output:
R

Editorial:
We will emulate the process with two queues. Let’s store in the first queue the moments of time when D-people will vote, and in the second queue - the moments of time of R-people. For every man where will be only one element in the queue.
Now compare the first elements in the queues. The man whose moment of time is less votes first. It’s obvious that it’s always profitable to vote against the first opponent. So we will remove the first element from the opponent’s queue, and move ourselves to the back of our queue, increasing the current time by n - next time this man will vote after n turns.
When one of the queues becomes empty, the corresponding party loses.